Question

упростите выражение, заранее спасибо

Answer 1

[(x-y)/(x+y)   - (x+y)/x-y)  ] : 4 /(x²-y²) =    

=[(x-y)²-(x+y)² /(x²-y²)  *(x²-y²) /4 =

=[(x-y)-(x+y)] [(x-y)+(x+y)] / 4 =

=(x-y-x-y)(x-y+x+y) /4=

=-2y*2x / 4 =

=-4xy /4=

-xy