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If xy=x+y and y> 2,which of the following must be true about
A.x=y
B.x=0
C.x=1
D.0
人气:421 ℃ 时间:2020-05-21 02:44:07
解答
xy-x-y+1=1,即(x-1)(y-1)=1,选E
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