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If xy=x+y and y> 2,which of the following must be true about A.x=yB.x=0C.x=1D.0
题目详情
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
A.x=y
B.x=0
C.x=1
D.0
▼优质解答
答案和解析
xy-x-y+1=1,即（x-1)(y-1)=1,选E
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