{2x+z=1,3x-y=1,x+2y-3z=8求解,需过程.谢
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{2x+z=1,3x-y=1,x+2y-3z=8求解,需过程.谢
{2x+z=1,3x-y=1,x+2y-3z=8
求解,需过程.
谢
{2x+z=1,3x-y=1,x+2y-3z=8求解,需过程.谢
2x+z=1 (1)
3x-y=1 (2)
x+2y-3z=8 (3)
(2)*2有
6x-2y=2 (4)
(3)+(4)有
7x-3z=10 (5)
(1)*3有
6x+3z=3 (6)
(5)+(6)有
13x=13,所以,x=1
代入(1)有,z= -1
代入(2)有,y=2
所以,原方程组的解为
x=1
y=2
z= -1
2x+z=1 (1)
3x-y=1 (2)
x+2y-3z=8 (3)
(1)×3+(2)
7x+2y=11 (4)
(2)×2+(4)
13x=13
x=1
y=3x-1=2
z=1-2x=-1
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