Расчетные задания (Кузнецов) / 09-Аналитическая геометрия
.pdf5.29. a ={−3, |
3, |
3}, |
b ={−4, |
7, 6}, c ={3, 0, |
−1}. |
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5.30. a ={−7, |
10, |
−5}, b ={0, |
−2, |
−1}, c ={−2, |
4, −1}. |
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5.31. a ={7, |
4, 6}, |
b ={2, 1, |
1}, |
c ={19, 11, 17}. |
Задача 6. Вычислить объем тетраэдра с вершинами в точках A1, A2 , A3 , A4 и его
высоту, опущенную из вершины A4 |
на грань A1 A2 A3 . |
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6.1. A1 (1, 3, |
6), A2 (2, 2, |
1), |
A3 (−1, |
0, 1), |
A4 (−4, |
6, |
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−3). |
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6.2. A1 (−4, |
2, |
6), A2 (2, |
−3, |
0), |
A3 (−10, |
5, |
8), A4 (−5, |
2, |
−4). |
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6.3. A1 (7, |
2, |
4), A2 (7, |
−1, |
−2), A3 (3, |
3, |
1), A4 (−4, |
2, |
1). |
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6.4. A1 (2, |
1, |
4), A2 (−1, |
5, |
−2), A3 (−7, |
−3, |
2), A4 (−6, |
−3, 6). |
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6.5. A1 (−1, |
−5, 2), |
A2 (−6, |
0, |
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−3), A3 (3, |
6, |
−3), A4 (−10, |
6, |
7). |
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6.6. A1 |
(0, |
−1, |
−1), A2 (−2, |
3, |
5), |
A3 (1, |
−5, |
−9), A4 (−1, |
−6, |
3). |
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6.7. A1 |
(5, |
2, |
0), A2 (2, |
5, |
0), |
A3 (1, |
2, |
4), |
A4 (−1, 1, |
1). |
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6.8. A1 |
(2, |
−1, |
−2), A2 (1, |
2, |
1), |
A3 (5, |
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0, |
−6), A4 (−10, |
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9, |
−7). |
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6.9. A1 |
(−2, |
0, |
−4), A2 (−1, |
7, |
1), |
A3 (4, |
−8, |
−4), A4 (1, |
−4, 6). |
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6.10. A1 (14, |
4, 5), |
A2 (−5, |
−3, |
2), A3 (−2, |
−6, |
−3), |
A4 (−2, |
2, −1). |
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6.11. A1 (1, |
2, |
0), A2 (3, |
0, |
−3), A3 (5, |
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2, |
6), A4 (8, |
4, |
−9). |
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6.12. A1 |
(2, |
−1, 2), |
A2 (1, |
2, |
−1), |
A3 (3, |
2, 1), |
A4 (−4, |
2, 5). |
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6.13. A1 |
(1, |
1, |
2), A2 (−1, |
1, |
3), |
A3 (2, |
−2, |
4), A4 (−1, |
0, |
−2). |
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6.14. A1 |
(2, |
3, |
1), A2 (4, |
1, |
−2) |
, A3 (6, |
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3, |
7), |
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A4 (7, 5, |
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−3). |
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6.15. A1 |
(1, |
1, |
−1), |
A2 (2, |
3, |
1), |
A3 (3, |
2, |
1), |
A4 (5, |
9, |
−8). |
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6.16. A1 (1, |
5, |
−7), A2 (−3, |
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6, |
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3), A3 (−2, |
7, |
3), |
A4 (−4, |
8, −12). |
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6.17. A1 (−3, |
4, |
−7), A2 (1, |
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5, |
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−4), A3 (−5, |
−2, |
0), A4 (2, |
5, |
4). |
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6.18. A1 (−1, |
2, |
−3), A2 (4, |
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−1, |
0), A3 (2, |
1, |
−2), A4 (3, 4, |
5). |
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6.19. A1 (4, |
−1, |
3), A2 (−2, |
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1, |
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0), A3 (0, |
−5, |
1), |
A4 (3, 2, |
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−6). |
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6.20. A1 (1, |
−1, |
1), |
A2 (−2, 0, |
3), |
A3 (2, |
1, |
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−1), |
A4 (2, −2, |
−4). |
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6.21. A1 (1, |
2, |
0), |
A2 (1, −1, |
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2), A3 (0, |
1, |
−1), |
A4 (−3, 0, |
1). |
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6.22. A1 (1, |
0, |
2), |
A2 (1, 2, |
−1), A3 (2, |
−2, |
1), |
A4 (2, 1, |
0). |
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6.23. A1 (1, |
2, |
−3), |
A2 (1, |
0, |
1), |
A3 (−2, |
−1, |
6), |
A4 (0, −5, |
−4). |
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6.24. A1 (3, |
10, |
−1), A2 (−2, |
3, |
−5), A3 (−6, |
0, |
−3), A4 (1, |
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−1, |
2). |
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6.25. A1 (−1, |
2, |
4), A2 (−1, |
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−2, |
−4), A3 (3, |
0, |
−1), A4 (7, |
−3, 1). |
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6.26. A1 (0, |
−3, |
1), |
A2 (−4, 1, |
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2), A3 (2, |
−1, |
5), |
A4 (3, 1, |
−4). |
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6.27. A1 (1, |
3, |
0), |
A2 (4, −1, |
2), |
A3 (3, |
0, |
1), |
A4 (−4, 3, |
5). |
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6.28. A1 |
(−2, |
−1, −1), |
A2 (0, |
3, |
2), A3 (3, |
1, |
−4), |
A4 (−4, |
7, |
3). |
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6.29. A1 |
(−3, |
−5, 6), |
A2 (2, |
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1, |
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−4), A3 (0, |
−3, |
−1), A4 (−5, |
2, −8). |
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6.30. A1 |
(2, |
−4, |
−3), A2 (5, |
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−6, |
0), A3 (−1, |
3, |
−3), A4 (−10, |
−8, 7). |
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6.31. A1 |
(1, |
−1, |
2), |
A2 (2, |
1, |
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2), |
A3 (1, |
1, |
4), |
A4 (6, −3, |
8). |
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Задача 7. Найти расстояние от точки M0 до плоскости, проходящей через точки
M1, M2 , M3 .
7.1. |
M1 (−3, |
4, |
−7), |
M2 (1, |
5, |
−4), M3 (−5, |
−2, |
0), |
M0 (−12, 7, |
−1). |
7.2. |
M1 (−1, |
2, |
−3), |
M2 (4, |
−1, |
0), M3 (2, |
1, |
−2), |
M0 (1, −6, |
−5). |
7.3. M1 (−3, |
−1, |
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1), M2 (−9, |
1, |
−2), |
M3 (3, |
−5, |
4), M0 ( |
−7, |
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0, |
−1). |
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7.4. M1 (1, |
−1, |
1), |
M2 (−2, 0, |
3), |
M3 (2, 1, |
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−1), M0 (−2, |
4, |
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2). |
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7.5. M1 (1, |
2, |
0), |
M2 (1, |
−1, |
2), |
M3 (0, 1, |
−1), |
M0 (2, −1, |
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4). |
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7.6. M1 (1, |
0, |
2), |
M2 (1, |
2, |
−1), |
M3 (2, −2, |
1), |
M0 (−5, −9, |
1). |
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7.7. M1 (1, |
2, −3), |
M2 (1, |
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0, |
1), |
M3 (−2, −1, |
6), |
M0 (3, |
−2, |
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−9). |
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7.8. M1 (3, |
10, |
−1), M2 (−2, |
3, |
−5), |
M3 (−6, |
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0, |
−3), M0 (−6, |
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7, |
−10). |
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7.9. M1 (−1, |
2, |
4), |
M2 (−1, |
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−2, |
−4), M3 (3, |
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0, |
−1), M0 (−2, |
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3, |
5). |
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7.10. M1 (0, |
−3, |
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1) |
, M2 (−4, |
1, |
2), |
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M3 (2, |
−1, 5), |
M0 (−3, |
4, |
−5). |
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7.11. M1 (1, |
3, |
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0), |
M2 (4, −1, |
2), |
M3 (3, |
0, |
1), |
M0 (4, 3, 0). |
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7.12. M1 (−2, |
−1, |
−1), M2 (0, |
3, |
2), M3 (3, |
1, −4), M0 (−21, |
20, |
−16). |
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7.13. M1 (−3, |
−5, |
6), |
M2 (2, |
1, |
−4), M3 (0, |
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−3, |
−1), M0 (3, |
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6, |
68). |
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7.14. M1 (2, |
−4, |
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−3), M2 (5, |
−6, |
0), M3 (−1, |
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3, |
−3), M0 (2, |
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−10, 8). |
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7.15. M1 (1, |
−1, |
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2), |
M2 (2, |
1, |
2), |
M3 (1, 1, |
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4), |
M0 (−3, 2, |
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7). |
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7.16. M1 (1, |
3, |
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6), |
M2 (2, |
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2, |
1), |
M3 (−1, 0, |
1), |
M0 (5, −4, |
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5). |
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7.17. M1 (−4, |
2, |
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6), |
M2 (2, |
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−3, |
0), M3 (−10, |
5, |
8), M0 (−12, |
1, |
8). |
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7.18. M1 (7, |
2, |
4), |
M2 (7, −1, |
−2), |
M3 (−5, |
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−2, |
−1), M0 (10, |
1, |
8). |
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7.19. M1 (2, |
1, |
4), |
M2 (3, |
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5, |
−2), |
M3 (−7, |
−3, |
2), |
M0 (−3, |
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1, |
8). |
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7.20. |
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M1 (−1, −5, |
2), |
M2 (−6, 0, |
−3), |
M3 (3, 6, |
−3), |
M0 (10, −8, |
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−7). |
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7.21. M1 (0, |
−1, |
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−1), M2 (−2, |
3, |
5), M3 (1, |
−5, |
−9), M0 (−4, |
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−13, |
6). |
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7.22. M1 (5, |
2, |
0), |
M2 (2, |
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5, |
0), |
M3 (1, |
2, |
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4), |
M0 (−3, |
−6, |
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−8). |
7.23. M1 (2, |
−1, |
−2), M2 (1, |
2, |
1), |
M3 (5, |
0, |
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−6), |
M0 (14, −3, |
7). |
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7.24. M1 (−2, |
0, |
−4), M2 (−1, |
7, 1), |
M3 (4, |
−8, |
−4), M0 (−6, |
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5, |
5). |
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7.25. M1 (14, |
4, |
5), |
M2 (−5, −3, |
2), |
M3 (−2, |
−6, |
−3), M0 (−1, |
−8, |
7). |
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7.26. M1 (1, |
2, |
0), |
M2 (3, |
0, |
−3), M3 (5, |
2, |
6), |
M0 (−13, −8, |
16). |
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7.27. M1 (2, |
−1, |
2), |
M2 (1, |
2, |
−1), |
M3 (3, |
2, |
1), |
M0 (−5, 3, |
7). |
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7.28. M1 |
(1, |
1, |
2), |
M2 (−1, |
1, |
3), M3 (2, |
−2, |
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4), |
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M0 (2, |
3, 8). |
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7.29. M1 |
(2, |
3, |
1), |
M2 (4, |
1, |
−2), M3 (6, |
3, |
7), |
M0 (−5, −4, |
8). |
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7.30. M1 |
(1, |
1, |
−1), |
M2 (2, |
3, |
1), M3 (3, |
2, |
1), |
M0 (−3, −7, |
6). |
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7.31. M1 |
(1, |
5, |
−7), |
M2 (−3, |
6, |
3), |
M3 (−2, |
7, |
3), |
M0 (1, |
−1, |
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2). |
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Задача |
8. |
Написать уравнение |
плоскости, |
проходящей через точку A |
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JJJG |
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перпендикулярно вектору BC . |
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8.1. A(1, |
0, |
−2), |
B(2, |
−1, |
3), C (0, |
−3, |
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2). |
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8.2. A(−1, |
3, |
4), |
B(−1, |
5, |
0), |
C (2, |
6, |
1). |
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8.3. A(4, |
−2, |
0), |
B(1, |
−1, −5), |
C (−2, 1, |
−3). |
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8.4. A(−8, |
0, |
7), |
B(−3, |
2, |
4), |
C (−1, 4, |
5). |
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8.5. A(7, |
−5, |
1), |
B(5, |
−1, −3), |
C (3, |
0, |
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−4). |
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8.6. A(−3, |
5, |
−2), |
B(−4, 0, |
3), |
C (−3, 2, |
5). |
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8.7. A(1, |
−1, |
8), |
B(−4, |
−3, 10), |
C (−1, |
−1, 7). |
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8.8. A(−2, |
0, |
−5), |
B(2, |
7, −3), |
C (1, |
10, |
−1). |
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8.9. A(1, |
9, |
−4), |
B(5, |
7, 1), C |
(3, 5, |
0). |
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8.10. |
A(−7, |
0, |
3), |
B(1, |
−5, |
−4), C (2, |
−3, 0). |
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8.11. |
A(0, |
−3, 5), |
B(−7, |
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2, |
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6), C (−3, |
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2, |
4). |
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8.12. |
A(5, |
−1, 2), |
B(2, |
−4, |
3), |
C (4, |
−1, |
3). |
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8.13. |
A(−3, |
7, |
2), |
B(3, |
5, |
1), C (4, |
5, |
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3). |
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8.14. |
A(0, |
−2, 8), |
B(4, |
3, |
2), C (1, |
4, |
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3). |
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8.15. |
A(1, |
−1, 5), |
B(0, |
7, |
8), C (−1, |
3, |
8). |
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8.16. |
A(−10, 0, 9), |
B(12, |
4, |
11), |
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C (8, |
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5, |
15). |
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8.17. |
A(3, |
−3, −6), |
B(1, |
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9, |
−5), C (6, |
6, |
−4). |
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8.18. |
A(2, |
1, |
7), B(9, 0, |
2), |
C (9, |
2, |
3). |
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8.19. |
A(−7, |
1, −4), |
B(8, |
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11, −3), |
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C (9, |
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9, −1). |
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8.20. |
A(1, |
0, −6), |
B(−7, |
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2, |
1), C (−9, |
6, |
1). |
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8.21. |
A(−3, |
1, |
0), |
B(6, |
3, |
3), C (9, |
4, |
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−2). |
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8.22. |
A(−4, |
−2, 5), |
B(3, |
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−3, −7), |
C (9, |
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3, −7). |
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8.23. |
A(0, |
−8, 10), |
B(−5, 5, |
7), |
C (−8, |
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0, |
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4). |
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8.24. |
A(1, |
−5, −2), |
B(6, |
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−2, 1), |
C (2, |
−2, −2). |
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8.25. |
A(0, |
7, −9), |
B(−1, |
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8, |
−11), C (−4, |
3, |
−12). |
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8.26. |
A(−3, |
−1, 7), |
B(0, |
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2, |
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−6), C (2, |
3, −5). |
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8.27. |
A(5, |
3, −1), |
B(0, |
0, |
−3), |
C (5, −1, |
0). |
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8.28. |
A(−1, |
2, −2), |
B(13, |
14, |
1), |
C (14, |
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15, |
2). |
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8.29. |
A(7, |
−5, |
0), |
B(8, |
3, |
−1), |
C (8, |
5, |
1). |
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8.30. |
A(−3, |
6, |
4), B(8, |
−3, |
5), C (10, |
−3, 7). |
8.31. |
A(2, |
5, |
−3), B(7, |
8, |
−1), C (9, |
7, 4). |
Задача 9. Найти угол между плоскостями.
9.1. |
x −3y +5 = 0, 2x − y +5z −16 = 0. |
9.2. |
x −3y + z −1 = 0, x + z −1 = 0. |
9.3. 4x −5y +3z −1 = 0, |
x −4 y − z +9 = 0. |
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9.4. 3x − y +2z +15 = 0, |
5x +9 y −3z −1 = 0. |
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9.5. 6x +2 y −4z +17 = 0, |
9x +3y −6z −4 = 0. |
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9.6. x − y 2 |
+ z −1 |
= 0, |
x + y 2 − z +3 = 0. |
9.7. 3y − z = |
0, 2y |
+ z = 0. |
9.8.6x +3y −2z = 0, x +2 y +6z −12 = 0.
9.9.x +2 y +2z −3 = 0, 16x +12 y −15z −1 = 0.
9.10. 2x − y +5z +16 = 0, |
x +2 y +3z +8 = 0. |
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9.11. 2x +2 y + z −1 = 0, |
x + z −1 = 0. |
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9.12. 3x + y + z −4 = 0, |
y + z +5 = 0. |
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9.13. 3x −2 y −2z −16 = 0, |
x + y −3z −7 =0. |
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9.14. 2x +2 y + z +9 = 0, |
x − y +3z −1 = 0. |
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9.15. x +2 y +2z −3 = 0, |
2x − y +2z +5 = 0. |
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9.16. 3x +2 y −3z −1 = 0, |
|
x + y + z −7 = 0. |
|
9.17. x −3y −2z −8 = 0, |
x + y − z +3 = 0. |
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9.18. 3x −2 y +3z +23 = 0, |
y + z +5 = 0. |
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9.19. x + y +3z −7 = 0, |
y + z −1 = 0. |
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9.20. x −2 y +2z +17 = 0, |
x −2 y −1 = 0. |
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9.21. x +2 y −1 = 0, |
x + y +6 = 0. |
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9.22. 2x − z +5 = 0, |
2x +3y −7 = 0. |
9.23. 5x +3y + z −18 = 0, |
2y + z −9 = 0. |
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9.24. 4x +3z −2 = 0, |
|
x +2 y +2z +5 = 0. |
|
9.25. x +4 y − z +1 = 0, |
2x + y +4z −3 = 0. |
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9.26. 2 y + z −9 = 0, |
x − y +2z −1 = 0. |
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9.27. 2x −6 y +14z −1 = 0, |
5x −15y +35z −3 = 0. |
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9.28. x − y +7z −1 = 0, |
2x −2 y −5 = 0. |
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9.29. 3x − y −5 = 0, |
2x + y −3 = 0. |
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9.30. x + y + z 2 −3 = 0, |
x − y + z 2 −1 = 0. |
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9.31. x +2 y −2z −7 = 0, |
x + y −35 =0. |
Задача 10. Найти координаты точки A, равноудаленной от точек B и C .
10.1. A(0, |
0, |
z), |
B(5, |
1, |
0), |
C (0, |
2, |
3). |
|
|
10.2. A(0, |
0, |
z), |
B(3, |
3, |
1), |
C (4, |
1, |
2). |
|
|
10.3. A(0, |
0, |
z), |
B(3, |
1, |
3), |
C (1, |
4, |
2). |
|
|
10.4. A(0, |
0, |
z), |
B(−1, |
−1, |
−6), C (2, |
3, |
5). |
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10.5. A(0, |
0, |
z), |
B(−13, 4, |
6), C (10, |
−9, 5). |
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10.6. A(0, |
0, |
z), |
B(−5, |
−5, |
6), C (−7, |
6, |
2). |
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10.7. A(0, |
0, |
z), |
B(−18, 1, |
0), C (15, |
−10, 2). |
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10.8. A(0, |
0, |
z), |
B(10, |
0, |
|
−2), C (9, |
−2, 1). |
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10.9. A(0, |
0, |
z), |
B(−6, |
7, |
|
5), C (8, |
−4, |
3). |
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10.10. A(0, |
0, |
z), |
B(6, |
−7, |
1), C (−1, |
2, |
5). |
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10.11. A(0, |
0, |
z), |
B(7, |
0, |
|
−15), C (2, |
10, −12). |
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10.12. A(0, |
y, |
0), |
B(3, |
0, |
|
3), |
C (0, |
2, 4). |
10.13.A(
10.14.A(
10.15.A(
10.16.A(
10.17.A(
10.18.A(
10.19.A(
10.20.A(
10.21.A(
10.22.A(
10.23.A(
10.24.A(
10.25.A(
10.26.A(
10.27.A(
10.28.A(
10.29.A(
10.30.A(
10.31.A(
0, y, 0), B(1, 6, 4), C (5, 7, 1). |
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0, |
y, |
0), |
B(−2, |
8, 10), C (6, 11, −2). |
0, |
y, |
0), |
B(−2, |
−4, 6), C (7, 2, 5). |
0, y, 0), B(2, 2, 4), C (0, 4, 2). 0, y, 0), B(0, −4, 1), C (1, −3, 5). 0, y, 0), B(0, 5, −9), C (−1, 0, 5). 0, y, 0), B(−2, 4, −6), C (8, 5, 1). 0, y, 0), B(7, 3, −4), C (1, 5, 7). 0, y, 0), B(0, −2, 4), C (−4, 0, 4). x, 0, 0), B(0, 1, 3), C (2, 0, 4).
x, 0, 0), B(4, 0, 5), C (5, 4, 2).
x, 0, 0), B(8, 1, −7), C (10, −2, 1). x, 0, 0), B(3, 5, 6), C (1, 2, 3).
x, 0, 0), B(4, 5, −2), C (2, 3, 4).
x, 0, 0), B(−2, 0, 6), C (0, −2, −4). x, 0, 0), B(1, 5, 9), C (3, 7, 11).
x, 0, 0), B(4, 6, 8), C (2, 4, 6). x, 0, 0), B(1, 2, 3), C (2, 6, 10).
x, 0, 0), B(−2, −4, −6), C (−1, −2, −3).
Задача 11. Пусть k – коэффициент преобразования подобия с центром в начале координат. Верно ли, что точка A принадлежит образу плоскости α ?
11.1. A(1, |
2, |
−1), |
α : 2x +3y + z −1 = 0, |
k = 2. |
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11.2. A(2, |
1, |
2), |
α : x −2 y + z +1 = 0, k = −2. |
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11.3. A(−1, |
|
1, |
|
1), |
|
α : 3x − y +2z +4 = 0, |
k =1 2. |
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11.4. A(−2, |
|
4, |
|
1), |
α : 3x + y +2z +2 = 0, |
k =3. |
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11.5. A(1, |
1 3, |
|
−2), |
α : x −3y + z +6 = 0, |
k =1 3. |
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11.6. A(1 2, |
1 3, |
1), |
α : 2x −3y +3z −2 = 0, |
k =1,5. |
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11.7. A(2, |
0, |
−1), |
α : x −3y +5z −1 = 0, |
k = −1. |
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11.8. A(1, |
−2, |
|
1), |
α : 5x + y − z +6 = 0, k = 2 3. |
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11.9. A(2, |
−5, |
|
4), |
α : 5x +2 y − z +3 =0, |
k = 4 3. |
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11.10. A(2, |
|
−3, 1), |
α : x + y −2z +2 = 0, |
k =5 2. |
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11.11. A(−2, |
3, |
−3), |
α : 3x +2 y − z −2 =0, |
k =3 2. |
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11.12. A(1 4, |
1 3, |
1), |
α : 4x −3y +5z −10 = 0, k =1 2. |
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11.13. A(0, |
|
1, |
|
−1), |
α : 6x −5 y +3z −4 = 0, |
k = −3 4. |
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11.14. A(2, |
|
3, |
|
−2), |
α : 3x −2 y +4z −6 = 0, |
k = −4 3. |
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11.15. A(−2, |
−1, |
1), |
α : x −2 y +6z −10 = 0, |
k =3 5. |
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11.16. A(5, |
|
0, |
|
−1), |
α : 2x − y +3z −1 = 0, |
k =3. |
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11.17. A(1, |
1, |
1), α : |
7x −6 y + z −5 = 0, k = −2. |
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11.18. A(1 3, |
1, |
1), |
α : 3x − y +5z −6 = 0, |
k =5 6. |
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11.19. A(2, |
|
5, |
|
1), |
α : 5x −2 y + z −3 = 0, |
k =1 3. |
11.20. A(−1, |
2, |
3), |
|
α : x −3y + z +2 = 0, |
k = 2,5. |
|
11.21. A(4, |
3, |
1), |
α : 3x −4 y +5z −6 = 0, |
k =5 6. |
||
11.22. A(3, |
5, |
2), |
α : 5x −3y + z −4 = 0, |
k =1 2. |
||
11.23. A(4, |
0, |
−3), |
|
α : 7x − y +3z −1 = 0, |
k =3. |
|
11.24. A(−1, |
1, |
−2), |
α : 4x − y +3z −6 = 0, k = −5 3. |
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11.25. A(2, |
−5, |
−1), α : 5x +2 y −3z −9 = 0, |
k =1 3. |
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11.26. A(−3, |
−2, 4), |
α : 2x −3y + z −5 = 0, |
k = −4 5. |
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11.27. A(5, |
0, |
−6), |
|
α : 6x − y − z +7 =0, |
k = 2 7. |
|
11.28. A(1, |
2, |
2), |
α : 3x − z +5 = 0, k = −1 5. |
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11.29. A(3, |
2, |
4), |
α : 2x −3y + z −6 = 0, |
k = 2 3. |
||
11.30. A(7, |
0, |
−1), |
|
α : x − y − z −1 = 0, k = 4. |
||
11.31. A(0, |
3, |
−1), |
|
α : 2x − y +3z −1 = 0, |
k = 2. |
Задача 12. Написать канонические уравнения прямой.
12.1. 2x + y + z −2 = 0, 2x − y −3z +6 = 0.
12.2. x −3y +2z +2 = 0, x +3y + z +14 = 0.
12.3. x −2 y + z −4 = 0, 2x +2 y − z −8 = 0.
12.4. x + y + z −2 = 0, x − y −2z +2 = 0.
12.5. 2x +3y + z +6 = 0, x −3y −2z +3 = 0.
12.6. 3x + y − z −6 = 0, 3x − y +2z = 0.
12.7. x +5 y +2z +11 = 0, x − y − z −1 = 0.
12.8. 3x +4 y −2z +1 = 0, 2x −4 y +3z +4 = 0.