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{2x-y+3z=21x+2y-z=33x+2y-2z=9}
题目详情
{2x-y+3z=21 x+2y-z=3 3x+2y-2z=9}
▼优质解答
答案和解析
{2x-y+3z=21 (1)
x+2y-z=3 (2)
3x+2y-2z=9 (3)
(1)*2+(2)得
5x+5z=45
x+z=9
(3)-(2)得
2x-z=6
所以
x=5,z=4
从而
y=1
即
{x=5
{y=1
{z=4
x+2y-z=3 (2)
3x+2y-2z=9 (3)
(1)*2+(2)得
5x+5z=45
x+z=9
(3)-(2)得
2x-z=6
所以
x=5,z=4
从而
y=1
即
{x=5
{y=1
{z=4
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