已知实数x,y满足√x-2 + (y+1)²=0,则x-y=多少?
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已知实数x,y满足√x-2 + (y+1)²=0,则x-y=多少?
已知实数x,y满足√x-2 + (y+1)²=0,则x-y=多少?
已知实数x,y满足√x-2 + (y+1)²=0,则x-y=多少?
x=2
y=-1
x-y=3
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