∵1/x+1/y=5
∴（x+y）/(x*y)=5
∴x+y=5xy
所以(2x-5xy+2y)/(x+2xy+y)=(10xy-5xy)/(5xy+2xy)=5/7分子2x-5xy+y如何化为10xy-5xy详细回答你是2x-5xy+2y=2x+2y-5xy=2(x+y)-5xy=2*5xy-5xy=10xy-5xy=5xy