化简(1+yx-y)÷xx2-y2．

题型：解答题难度：一般来源：无为县

化简(1+

y

x-y

)÷

x

x2-y2

．

答案

原式=（

x-y

x-y

+

y

x-y

）×

(x-y)(x+y)

x

=

x

x-y

•

(x-y)(x+y)

x

=x+y．
故答案为x+y．