\(bài2\\ a,x\left(1-y\right)+y\left(1-y\right)=\left(x+y\right)\left(1-y\right)\\ b,=\left(x^2-4x+4\right)-y^2\\ =\left(x-2\right)^2-y^2\\ =\left(x-2-y\right)\left(x-2+y\right)\\ c,=x^2-3x+x-3\\ =x\left(x-3\right)+\left(x-3\right)\\ =\left(x+1\right)\left(x-3\right)\)
Bài 2:
a: =x(1-y)+y(1-y)=(1-y)(x+y)
b: =(x-2)2-y2=(x-2-y)(x-2+y)
c: =(x-3)(x+1)