Question

Разложите на множители1) c(a-b)+b(b-a) 
2) a(b-c) -c(c-b)
3)(x-y)+b(y-x)
4)2b(x-y)-(y-x)

Answer 1

1) =ac-bc+b^2-ab
2) = ab-ac-c^2+bc
3) = x-y+by-bx
4) = 2bx-2by-y+x