已知(x-y)2-2x+2y+1=0,则(x-y)^3是多少
问题描述:
已知(x-y)2-2x+2y+1=0,则(x-y)^3是多少
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答
(x-y)²-2(x-y)+1=0
(x-y-1)²=0
x-y-1=0
x-y=1
(x-y)³=1