①3x-y+z=3
②2x+y-3z=11
③x+y+z=1
①-③ 2x-2y=2 x-y=1
②+3③5x+4y=14
x=2,y=1
则z=-2
{3x-y+z=3 2x+y-3z=11 x+y+z=1 注意：x+y+z=1 不等于12!
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