Verified answer

Ответ:

Объяснение:

1. (x+y)/(x-y)-(x-y)/(x+y)=((x+y)²-(x-y)²)/((x+y)(x-y))=

=(x²+2xy+y²-x²+2xy-y²)/((x+y)(x-y))=4xy/((x+y)(x-y)).

2. (4xy/((x+y)(x-y)))*(x-y)/2y=2x/(x+y).