Question

2(x+y)+a(-x-y)(-x-y)+(x-y)(x-y)(x-y)=

Answer 1

2(x+y)+a(x+y)^2+(x-y)^3=2x+y+ax^2+2axy+ay^2+x^3-3x^2y+3xy^2+y^3

Answer 2

надеюсь помогла)))))))))