Question

Giúp em 3 câu gạch bút xanh gấp ạ

Answer 1

8) Ta có: \(x^2y+xy^2-4x-4y\)

\(=xy\left(x+y\right)-4\left(x+y\right)\)

\(=\left(x+y\right)\left(xy-4\right)\)

12) Ta có: \(a^2+2ab+b^2-ac-bc\)

\(=\left(a+b\right)^2-c\left(a+b\right)\)

\(=\left(a+b\right)\left(a+b-c\right)\)

Answer 2

10: Sửa đề: \(a^3-a^2x-ay+xy\)

Ta có: \(a^3-a^2x-ay+xy\)

\(=a^2\left(a-x\right)-y\left(a-x\right)\)

\(=\left(a-x\right)\left(a^2-y\right)\)