2x+y+z=4 x+2y+z=12 x+y+2z=24
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2x+y+z=4 x+2y+z=12 x+y+2z=24
2x+y+z=4 x+2y+z=12 x+y+2z=24
2x+y+z=4 x+2y+z=12 x+y+2z=24
2x+y+z=4 x+2y+z=12 x+y+2z=24
三式相加得
x+y+z=10
x=-6
y=2
z=14
x=-6,y=2,z=14
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