Question

упростите выражение 2x+2y/2 - x^2+y^2/x+y

Answer 1

2(x+y)/2 - (х²+y²)/(x+y)=
=(x+y)(x+y)-x²-y²)/(x+y)=
=(х²+2xy+y²-х²-y²)/(x+y)=
=2xy/(x+y)