Контрольные работы / 2
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Контрольная работа № 2
Матрицы и линейные преобразования
Задание 1
Для данной матрицы A вычислить а) A3 ;
б) A AT − AT A .
Задание 2
Вычислить определитель матрицы.
Задание 3
Решить систему линейных уравнений по правилу Крамера.
Задание 4
Найти матрицу A−1 , обратную данной матрице A и проверить выполнение условия A A−1 = E.
Задание 5
Решить матричное уравнение.
Задание 6
Решить систему линейных уравнений с комплексными числами.
Задание 7
Найти собственные значения и собственные векторы матрицы.
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Вариант 1
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−3 |
−1 |
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−3 |
−4 0 |
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1. а) |
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−2 |
−5 |
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−3 |
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5 −4 |
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−5 |
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2 |
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−1 |
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− x1 +3x2 + 2x3 = −4, |
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−3 0 |
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2. |
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0 −3 −2 2 |
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3. |
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x2 −2x3 = −3, |
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−2 |
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−1 |
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4x |
−3x |
+5x = 20. |
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−5 |
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4. |
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−2 |
−3 −1 |
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A = |
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1 |
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−5 0 |
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−21 1 |
24 |
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5. |
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−3 |
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−5 4 |
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−5 |
−5 10 |
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−2 4 2 |
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12 |
−10 −14 |
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(5 +4i)z |
− (3 +2i)z |
= 20 −15i, |
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6. |
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5iz |
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(1−4i)z2 |
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19. |
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−7 |
12 |
6 |
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7. A = |
−5 9 3 . |
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−3 |
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Вариант 2
5 −3 4 |
−3 |
0 |
5 |
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1. а) A = |
−2 |
5 |
−1 ; |
б) A = |
2 −1 |
4 . |
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−5 |
5 |
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−2 |
−3 |
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3 |
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−2 |
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0 |
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3 |
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− x1 +3x2 + 2x3 = 0, |
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0 0 |
2 |
−3 −3 |
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2. |
0 |
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−2 1 −2 |
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3. |
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2x2 −4x3 = −8, |
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−2 |
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4x |
−3x |
+5x = 26. |
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−5 |
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4. |
A = |
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3 . |
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3 |
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−2 |
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5 −4 5 |
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−31 −16 −27 |
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5. |
4 |
−2 1 |
X = |
−11 −8 −12 . |
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−4 |
−3 |
− |
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0 |
19 |
34 |
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4 |
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6. |
(3 +3i)z1 |
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5z2 |
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= −7 +18i, |
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(2 −i)z |
+ |
(4 −5i)z |
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= 3 +14i. |
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4 |
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7. A = |
2 0 −6 . |
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−2 |
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10 |
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Вариант 3
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0 |
1 3 |
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4 |
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−1 −3 |
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1. а) A = |
−4 2 4 |
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б) A = |
4 |
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0 −5 . |
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−3 |
−4 0 |
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2 |
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3 |
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−3 |
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5 |
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1 |
3 |
16 |
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8 |
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− x1 +3x2 + 2x3 = 4, |
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2 |
−2 2 −20 −19 |
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2. |
2 |
−2 3 |
6 |
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−4 |
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3. |
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3x2 −6x3 |
= −15, |
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0 |
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−2 |
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−1 |
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4x |
−3x |
+5x |
= 32. |
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−2 |
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−3 |
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0 |
3 |
−3 |
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4. A = |
2 −2 3 . |
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−3 |
3 |
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−3 |
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3 |
−3 1 |
−21 14 5 |
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5. X |
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0 |
−7 12 |
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−3 1 1 = |
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1 |
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3 |
−11 9 |
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0 1 |
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2iz1 |
− (3 +3i)z2 |
= −8 −20i, |
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6. |
+5i)z1 + (4 +4i)z2 |
= −28 +4i. |
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(2 |
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−12 |
−8 |
16 |
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7. A = |
−8 0 |
8 . |
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−16 |
−8 |
20 |
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Вариант 4
−4 2 |
−5 |
2 |
5 |
3 |
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1. а) A = |
3 |
−2 5 ; |
б) A = |
0 |
5 |
5 . |
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4 |
4 |
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4 |
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−2 |
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−5 1 |
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13 |
−17 |
−3 |
3 |
0 |
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− x1 +3x2 + 2x3 =8, |
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4 |
−1 −3 −3 0 |
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2. |
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−11 |
20 |
0 |
2 |
1 |
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3. |
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4x2 −8x3 = −24, |
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3 |
0 |
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4x |
−3x |
+5x = 38. |
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3 |
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−2 |
3 |
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4 |
1 |
−4 |
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4. A = |
1 |
−2 |
−4 |
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−1 |
2 |
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47
5 |
−5 |
4 |
−15 25 −35 |
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5. |
−5 1 1 |
X = |
−5 |
−16 |
6 |
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3 |
−2 |
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−4 |
7 |
−8 |
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6. |
(5 +3i)z1 |
+ |
4iz2 |
= −6 +12i, |
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+3i)z1 |
− |
(5 −i)z2 |
= 3 −11i. |
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(−3 |
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42 |
−12 |
48 |
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7. |
A = |
20 |
−4 24 . |
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−28 |
8 |
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−32 |
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Вариант 5
5 |
−3 |
2 |
2 |
3 |
5 |
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1. а) A = |
1 |
4 |
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б) A = |
−3 3 |
1 . |
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3 |
−1 |
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0 |
−4 |
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−5 |
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−2 |
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2 |
−1 |
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2 |
0 |
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− x1 +3x2 + 2x3 =12, |
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−2 |
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−3 |
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2. |
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−2 |
−2 |
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3 |
0 |
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3. |
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5x2 −10x3 = −35, |
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0 |
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3 |
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−3 |
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4x |
−3x |
+5x = 44. |
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−1 |
−3 |
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−1 |
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4. A = |
0 −1 0 . |
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0 −1 |
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−1 |
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−1 2 |
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−1 |
−23 |
−11 15 |
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5. |
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−4 |
−3 3 |
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−17 |
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−21 18 . |
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−5 |
−3 5 |
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32 |
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17 −23 |
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−(5 +i)z |
+ (4 +2i)z |
= −31+13i, |
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6. |
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−5z |
1 |
− (4 −2i)z2 |
= −6 −17i. |
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−1 |
−4 |
−4 |
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7. A = |
1 |
3 |
−1 . |
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1 |
2 |
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Вариант 6
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5 |
−1 |
4 |
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1. а) A = |
1 |
5 5 ; |
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−3 |
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−5 |
3 |
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0 |
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−3 |
3 |
−3 |
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0 |
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−1 |
−1 |
−1 |
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2. |
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−2 |
0 |
3 |
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3 |
2 |
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1 |
−1 |
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4 |
−1 |
−4 |
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4. A = |
−4 −5 5 . |
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5 |
3 |
−3 |
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−2 |
−1 |
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−13 |
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5. |
5 −2 −4 |
X = |
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3 |
−4 |
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36 |
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6. |
(3 +2i)z1 |
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+ |
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5iz2 |
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(3 −i)z |
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− (4 +i)z |
2 |
= |
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1 |
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−2 |
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18 |
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7. A = |
−3 |
4 |
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9 . |
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−3 |
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13 |
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−1 |
4 |
−5 |
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б) A = |
0 |
4 |
−1 . |
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1 |
−4 |
−3 |
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− x1 +3x2 + 2x3 |
=16, |
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3. |
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6x2 −12x3 = −48, |
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4x |
−3x |
+5x |
= 50. |
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1 |
2 |
3 |
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217
−12 −19 .
−14 2
7 +9i,
10.
49
Вариант 7
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1 |
2 |
3 |
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1. а) A = |
5 |
2 |
5 ; |
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−4 |
5 |
1 |
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2 |
−3 |
−2 |
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5 |
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−12 |
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−3 1 |
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17 |
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−13 |
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2. |
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2 |
−2 |
0 |
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−13 −12 |
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0 |
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0 |
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−1 |
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3 |
2 |
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4. A = |
0 −3 −3 . |
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0 |
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−2 |
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2 |
−1 |
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−9 |
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5. |
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−1 |
−5 |
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1 |
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10 |
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3 |
5 |
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− |
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−10 |
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6. |
(3 +2i)z1 |
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+ (3 −5i)z2 |
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+ (1+4i)z2 |
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(−1+4i)z1 |
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−22 |
12 |
−24 |
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7. A = |
−12 8 −12 . |
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16 |
−8 |
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18 |
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4 |
1 |
−1 |
б) A = |
−4 |
0 |
−1 . |
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−1 |
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−3 1 |
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− x1 +3x2 + 2x3 = 20, |
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3. |
7x2 −14x3 = −63, |
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4x −3x +5x |
=56. |
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1 |
2 |
3 |
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10 |
−9 |
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6 |
10 |
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−44 |
30 |
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=20 +2i,
=−22 +22i.
50
Вариант 8
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5 −2 1 |
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2 0 −4 |
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1. а) A = |
5 −3 2 ; |
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б) A = |
−3 4 2 . |
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−2 0 0 |
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−5 2 −3 |
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−14 |
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− x1 +3x2 + 2x3 = 24, |
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2. |
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−12 |
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1 |
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8x2 −16x3 = −80, |
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4x |
−3x |
+5x = 62. |
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4. A = |
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1 −2 . |
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3 −2 −5 |
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28 −14 −12 |
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5 4 |
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X = |
−8 8 |
2 . |
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−1 |
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20 |
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5iz1 |
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iz2 |
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−23, |
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6. |
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+ (2 −5i)z2 |
= −19 +20i. |
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(−4 +5i)z1 |
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6 |
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12 |
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7. A = |
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6 . |
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−4 |
−8 |
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51
Вариант 9
4 |
2 |
3 |
−5 |
−1 |
3 |
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1. а) A = |
1 |
−3 −5 ; |
б) A = |
−3 |
2 |
4 . |
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−2 3 |
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1 |
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4 |
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2 |
1 |
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− x1 +3x2 + 2x3 |
= 28, |
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−2 |
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2. |
0 |
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3 |
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3. |
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9x2 −18x3 = −99, |
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4x |
−3x |
+5x |
= 68. |
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4. A = |
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1 −1 . |
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−5 |
5 −3 |
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−7 21 −9 |
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5. X |
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−5 4 |
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6 −33 20 |
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6. |
−(1+2i)z1 |
− (2 −i)z2 |
= −8 −16i, |
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(4 +5i)z |
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+ |
(4 +4i)z |
2 |
= −1+44i. |
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1 |
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−6 |
12 |
6 |
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7. A = |
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10 3 . |
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4 |
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Вариант 10
5 |
−5 |
−2 |
2 |
2 |
−2 |
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1. а) A = |
−1 −4 |
−2 ; |
б) A = |
2 |
0 |
−3 . |
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0 |
4 |
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5 |
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−1 2 |
52
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2. |
0 |
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−3 |
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4. A = |
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−2 2 . |
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−5 |
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1 |
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17 |
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5. |
0 0 3 |
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X = |
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0 |
−5 |
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−27 |
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−2 |
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6. |
(−5 +i)z1 |
− (1+i)z2 |
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(2 −4i)z |
+ |
(2 −3i)z |
2 |
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1 |
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4 |
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7. A = |
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−2 9 . |
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3 |
−6 |
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13 |
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− x1 +3x2 + 2x3 = −4, 3. 3x1 + x2 −2x3 = 24,4x1 −3x2 +5x3 =8.
−3 |
−2 |
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0 |
−6 |
. |
−6 |
0 |
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=6 −20i,
=23 +3i.
Вариант 11
3 |
2 |
4 |
−1 −5 −3 |
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1. а) A = |
−2 |
0 |
4 ; |
б) A = |
4 |
5 |
−1 . |
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−5 |
−3 |
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5 |
2 |
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−5 |
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2 |