将x+3y=5y,y-2z=5,x+z=5,
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将x+3y=5y,y-2z=5,x+z=5,将x+3y=5y,y-2z=5,x+z=5,将x+3y=5y,y-2z=5,x+z=5,x=2yy-2z=52y+z=5y-2z=2y+zy=-3z-3z-
将x+3y=5y,y-2z=5,x+z=5,
将x+3y=5y,y-2z=5,x+z=5,
将x+3y=5y,y-2z=5,x+z=5,
x=2y
y-2z=5
2y+z=5
y-2z=2y+z
y=-3z
-3z-2z=5
z=-1
y=3
x=6
x=8 y=-1 z=-3
第一个错了，是x+3y=5
x+3y=5 (1)
y-2z=5 (2)
x+z=5 (3)
(1)-(2)
3y-z=0 (4)
(4)×2-(2)
5y=-5
y=-1
z=3y=-3
x=5-z=8
所以
x=8,y=-1,z=-3
x=6，y=3，z=-1
由题意，得
x=2y;y-2z=5;x+z=5
把x=2y代入方程组，得
y-2z=5;2y+z=5
即y-2z=5;4y+2z=10
解得y=3;z=-1
所以 x=6
y=3
z=-1
将x+3y=5y,y-2z=5,x+z=5,
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