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Консультация № 143803
13.09.2008, 15:20
0.00 руб.
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Здравствуйте уважаемые экспреты, у меня в Университете есть Высшая математика. Я в ней очень плохо разбираюсь. И сколько чего бы я не делал. Я все равно не до чего не могу прийти. Сейчас у нас тема Определители n-го порядка и матрицы. Я очень прошу вас помочь мне решить два задания по контрольной работе. Я хочу увидеть как оно решается. Ведь лучше один раз увидеть чем сто раз услышать. В теории неочень понятно это расписано. Пожалуйста помогите. Искренне надеюсь на вашу помощь. 
Приложение:
Два примера:
http://s45.radikal.ru/i110/0809/af/ee833a1ed584.jpg
Приложение:
Два примера:
http://s45.radikal.ru/i110/0809/af/ee833a1ed584.jpg
Обсуждение
Неизвестный
14.09.2008, 20:13
общий
это ответ
Здравствуйте, Пашков Дмитрий Владимирович!
1. Решение методом Крамера:
составляем основной определитель, состоящий из коэффициентов при неизвестных
8 3 -6 5 3 -3
1 1 -1 = 0 1 0 =-1
4 1 -3 3 1 -5
дополнительный определитель 1, получается заменой коэффициентов при 1 неизвестном на результат
-4 3 -6
2 1 -1 =-1
-5 1 -3
второй определитель
8 -4 -6
1 2 -1 =-6
4 -5 -3
третий определитель
8 3 -4
1 1 2 =-5
4 1 -5
Решение получаем дополнительный определитель делим на главный
х1=-1/-1=1
х2=-6/-1=6
х3=-5/-1=5
В вашем рисунке следующие цифры соответственно:
1
-4 3 -6
2 1 -1 , -1
-5 1 -3
8 -4 -6
1 2 -1 , -6
4 -5 -3
8 3 -4
1 1 2 , -5
4 1 -5
1
6
5
2 Решение методом обратной матрицы
В вашем рисунке
3 -2 4
3 4 -2
2 -1 -1 , 10
0.1 0.1 0.2
0.01 0.18 -0.3
0.18 0.01 -0.3
12
6
-9
0
4
5
0
4
5
1. Решение методом Крамера:
составляем основной определитель, состоящий из коэффициентов при неизвестных
8 3 -6 5 3 -3
1 1 -1 = 0 1 0 =-1
4 1 -3 3 1 -5
дополнительный определитель 1, получается заменой коэффициентов при 1 неизвестном на результат
-4 3 -6
2 1 -1 =-1
-5 1 -3
второй определитель
8 -4 -6
1 2 -1 =-6
4 -5 -3
третий определитель
8 3 -4
1 1 2 =-5
4 1 -5
Решение получаем дополнительный определитель делим на главный
х1=-1/-1=1
х2=-6/-1=6
х3=-5/-1=5
В вашем рисунке следующие цифры соответственно:
1
-4 3 -6
2 1 -1 , -1
-5 1 -3
8 -4 -6
1 2 -1 , -6
4 -5 -3
8 3 -4
1 1 2 , -5
4 1 -5
1
6
5
2 Решение методом обратной матрицы
В вашем рисунке
3 -2 4
3 4 -2
2 -1 -1 , 10
0.1 0.1 0.2
0.01 0.18 -0.3
0.18 0.01 -0.3
12
6
-9
0
4
5
0
4
5
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