Question

Помогите решить 3х+ху^2-х^2у-3у-3(х-у)-ху(у+х)

Answer 1

$3x+xy^2-x^2y-3y-3(x-y)-xy(y+x)= \\ =3x+xy^2-x^2y-3y-3x+3y-xy^2-x^2y=-2x^2y$