Question

Answer 1

Bài 1:

\(a,3x^2y+6xy+3y=3y\left(x^2+2x+1\right)=3y\left(x+1\right)^2\\ b,16x^2-y^2=\left(4x-y\right)\left(4x+y\right)\\ c,x^2y-xy^2+7x-7y=xy\left(x-y\right)+7\left(x-y\right)=\left(x-y\right)\left(xy+7\right)\\ d,x^2-y^2-4x+4=\left(x^2-4x+4\right)-y^2=\left(x-2\right)^2-y^2=\left(x-y-2\right)\left(x+y-2\right)\)