a/ \(2x^2\left(1-x\right)-4x\left(x-1\right)\)
\(=2x^2\left(1-x\right)+4x\left(1-x\right)\)
\(=\left(1-x\right)\left(2x^2+4x\right)\)
\(=\left(1-x\right)2x\left(x+2\right)\)
b/ \(x-y-x^2+2xy-y^2\)
\(=\left(x-y\right)-\left(x^2-2xy+y^2\right)\)
\(=\left(x-y\right)-\left(x-y\right)^2\)
\(=\left(x-y\right)\left(1-x+y\right)\)
a/ Ta có:
\(2x^2\left(1-x\right)-4x\left(x-1\right)\)
= \(2x^2\left(1-x\right)+4x\left(1-x\right)\)
= \(\left(1-x\right)\left(2x^2+4x\right)\)
= 2x(1-x)(x+2)
* Câu b tự làm. Mi ngu lắm, bài này mà ko làm đc.
* Đồ con heo.