Question

Разложите на множители y^2-xy^2+xy-y

Answer 1

Y(y-xy+x-1)
Вот и все.)

Answer 2

$y^2-xy^2+xy-y=y^2(1-x)-y(-x+1)= \ =y^2(1-x)-y(1-x)= \ = (y^2-y)(1-x)=y(y-1)(1-x)$