Помогите!
1) x(a-b)+y(b-a)
2)m^2(a-2)+n(2-a)
3)2m(x-y)-y+x
4)2n(x-y)-(y-x)

1)x (a-b)-y(a-b)=(a-b)(x-y)2)m^2 (a-2)-n(a-2)=(a-2)(m^2-n)3)2m (x-y)-(x-y)=(x-y)(2m-1)4)2n (x-y)+(x-y)=(x-y)(2n+1)