If xy=x+y and y> 2,which of the following must be true about

问题描述:

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
1个回答 分类:数学 2014-10-22

问题解答:

我来补答
xy-x-y+1=1,即(x-1)(y-1)=1,选E
 
 
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