解方程组 z=x+y 2x-3y+2z=5 x+2y-z=3
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解方程组z=x+y2x-3y+2z=5x+2y-z=3解方程组z=x+y2x-3y+2z=5x+2y-z=3解方程组z=x+y2x-3y+2z=5x+2y-z=3x+y-z=0(1)x+2y-z=3(
解方程组 z=x+y 2x-3y+2z=5 x+2y-z=3
解方程组 z=x+y 2x-3y+2z=5 x+2y-z=3
解方程组 z=x+y 2x-3y+2z=5 x+2y-z=3
x+y-z=0 (1)
x+2y-z=3 (2)
2x-3y+2z=5 (3)
2-1式得y=3
将y=3代入2、3得
x-z=-3 (4)
x+z=7 ( 5)
4+5式得2x=4 解得x=2 y=5
综合得x=2 y=3 z=5
解方程组:2x+y+z=-4 x+2y+z=-2 x+y+2z=3
解方程组 z=x+y 2x-3y+2z=5 x+2y-z=3
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