若x+y+1的绝对值与(x-2y)的²互为相反数,则x-y=
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若x+y+1的绝对值与(x-2y)的²互为相反数,则x-y=
若x+y+1的绝对值与(x-2y)的²互为相反数,则x-y=
若x+y+1的绝对值与(x-2y)的²互为相反数,则x-y=
由题意知:
x+y+1=0
x-2y=0
所以x=-2/3,y=-1/3
x-y=-2/3-(-1/3)=-1/3
x+y+1的绝对值>=0
(x-2y)的²>=0
若x+y+1的绝对值与(x-2y)的²互为相反数,
则
x+y+1=0
x-2y=0 y=-1/3 x=-2/3
x-y=-1/3