Question

mong làm hết ạ

Answer 1

a: \(=x^2y^2+a^2b^2+a^2y^2+x^2b^2\)

\(=x^2\left(y^2+b^2\right)+a^2\left(y^2+b^2\right)\)

\(=\left(b^2+y^2\right)\left(x^2+a^2\right)\)

c: \(=x^2-mx-nx+mn=x\left(x-m\right)-n\left(x-m\right)=\left(x-m\right)\left(x-n\right)\)