|x+2y|+|y-3|+|z-2x|=0 求x+3y+z的值
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|x+2y|+|y-3|+|z-2x|=0 求x+3y+z的值
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|x+2y|+|y-3|+|z-2x|=0
x+2y=0
y-3=0
z-2x=0
x=-6
y=3
z=-12
x+3y+z=-9
x+2y=0
y-3=0
z-2x=0
x=-6
y=3
z=-12
x+3y+z=-9
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