已知1/x+1/y=5,则2x−5xy+2yx+2xy+y=_.
问题描述:
已知
+1 x
=5,则1 y
=______. 2x−5xy+2y x+2xy+y
答
∵
+1 x
=5,1 y
∴x+y=5xy,
∴原式=
=2×5xy−5xy 2xy+5xy
,5 7
故答案是
.5 7