e幾題可唔可以factorize?(20marks)急!!

Reminder: (x-y) = -(y-x)

1) (5a-2)+3y(2-5a)
= (5a-2) - 3y(5a-2)
= (5a-2)(1-3y)
2) m(a+b)+n(b-a)
(Cannot be further factorized)
3) x(2y-4)-(4-2y)
= x(2y-4)+(2y-4)
= (2y-4)(x+1)
4) (6x-y)+q(6x+y)
(Cannot be further factorized)

(5a-2)+3y(2-5a)
(5a-2)-3y(5a-2)
(1-3y)(5a-2)
_________________
m(a+b)+n(b-a)
Can not be factorized
__________________
) x(2y-4)-(4-2y)
2x(y-2)+2(y-2)
(2x+2)(y-2)
2(x+1)(y-2)
_________________
(6x-y)+q(6x+y)
Can not be factorized
______________