Question

计算：

x2-y2

x

÷(x-

2xy-y2

x

)．

Answer 1

x2-y2

x

÷(x-

2xy-y2

x

)，
=

(x+y)(x-y)

x

÷(

x2-2xy+y2

x

)，
=

(x+y)(x-y)

x

×

x

(x-y)2

，
=

x+y

x-y

．