x-2y=z 3x+2y=1 2x-y=z+0.5
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x-2y=z 3x+2y=1 2x-y=z+0.5
x-2y=z 3x+2y=1 2x-y=z+0.5
x-2y=z 3x+2y=1 2x-y=z+0.5
(1)代入(3)得
2x-y=x-2y+0.5
∴x+y=0.5 (4)
(2)-(4)×2得
x=0
把 x=0代入(2)得
y=1/2
把x=0,y=1/2代入(1)得
z=-1
∴x=0,y=1/2,z=-1
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