已知(x+y)^2-2x+2y+1=0,则(x+y)^999=
2个回答
应已知(x+y)^2-2x-2y+1=0,
则(x+y)^2-2(x+y)+1=0,
则(x+y-1)^2=0
则x+y=1
则(x+y)^999=1
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