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