Câu trong ảnh làm như nào các bạn ơi...

Bao Tien

a)

$2x-8y=2\left(x-4y\right)$

b)

$7x^2y-14xy^2+28x^2y^2=7xy\left(x-2y+4xy\right)$

c)

$5x^2\left(x-2y\right)-15x\left(x-2y\right)=x\left(x-2y\right)\left(5x-15\right)=5x\left(x-2y\right)\left(x-3\right)$

d)

$6x\left(x-y\right)-8y\left(y-x\right)=6x\left(x-y\right)+8y\left(x-y\right)=\left(x-y\right)\left(6x+8y\right)=2\left(x-y\right)\left(3x+4y\right)$.