Question

Разложите на множители
1)7х^5y^3-7x^2y^2-21xy^2
2)2х-y^2+x^2-2y

Answer 1

$1) 7x^5y^3-7x^2y^2-21xy^2 = 7xy^2(x^4y-x-3) \ \ 2) 2x-y^2+x^2-2y = (2x+x^2)-(y^2+2y) = \ =x(2+x)-y(y+2) = (x-y)(x+y+2) =$