4x+3z=9 2x-6y+4z=5 3x+2y+z=8 4x+3z=9 2x-6y+4z=5 3x+2y+z=8

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4x+3z=92x-6y+4z=53x+2y+z=84x+3z=92x-6y+4z=53x+2y+z=84x+3z=92x-6y+4z=53x+2y+z=84x+3z=92x-6y+4z=53x+2y

4x+3z=9 2x-6y+4z=5 3x+2y+z=8 4x+3z=9 2x-6y+4z=5 3x+2y+z=8
4x+3z=9 2x-6y+4z=5 3x+2y+z=8
4x+3z=9 2x-6y+4z=5 3x+2y+z=8

4x+3z=9 2x-6y+4z=5 3x+2y+z=8 4x+3z=9 2x-6y+4z=5 3x+2y+z=8
4x+3z=9 (1)
2x-6y+4z=5 (2)
3x+2y+z=8 (3)
(3)*3+(2)得
11x+7z=29 (4)
(4)*3-(1)*7得
5x=87-63=24
x=24/5
代入(1)
3z=9-4*24/5
z=3-32/5=-17/5
代入(2)
6y=5-2*24/5+4*17/5
=(25+68-48)/5=9
y=3/2

(3x+2y+z=8)*3+(2x_6y+4z=5)=11x+7z=29
(4x+3)

很简单求解答详细步骤多谢我没纸和比
2x+4y+3z=9.................(1)
3x-2y+5z=11 ..............(2)
5x-6y+7z=13...............(3)
(1)+(2)*2:
8x+13z=31...................(4)
(2)*3-(1):
4x+8z=20...

全部展开

很简单

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