Question

Упростить выражение: (ху/х-у)*(1/х+1/у)-(х+у)/(х-у)

Answer 1

1/x+1/y=(y+x)/xy
xy/(x-y)*(y+x)/xy=(x+y)/(x-y)
(x+y)/(x-y)-(x+y)/(x-y)=0