Đáp án:
Giải thích các bước giải:
$\text{2a(x+y)-4(x+y)}$
$\text{= (2a-4)(x+y)}$
$\text{= 2(a-2)(x+y)}$
$\text{-2ab(x-y)-4a(x-y)}$
$\text{=(-2ab-4a)(x-y)}$
$\text{= -2a(b+2)(x-y)}$
$\text{-2a²(x-1)+4a(1-x)}$
$\text{= -2a²(x-1)-4a(x-1)}$
$\text{= (-2a²-4a)(x-1)}$
$\text{= -2a(a+2)(x-1)}$
$\text{-3a(x-3)-a²(3-x)}$
$\text{= -3a(x-3)+a²(x-3)}$
$\text{= (-3a+a²)(x-3)}$
$\text{= a(-3+a)(x-3)}$