若|x+y+1|与(x-2y)²互为相反数,则x-y=多少

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若|x+y+1|与(x-2y)²互为相反数,则x-y=多少
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若|x+y+1|与(x-2y)²互为相反数,则x-y=多少
若|x+y+1|与(x-2y)²互为相反数,则x-y=多少

若|x+y+1|与(x-2y)²互为相反数,则x-y=多少
即|x+y+1|+(x-2y)²=0
所以x+y+1=0
x-2y=0
相减
3y+1=0
y=-1/3
x=2y=-2/3
所以x-y=-1/3