Question

giúp mik vs ạ

 

Answer 1

d: Sửa đề: x^2-3x-9y^2-9y

=(x^2-9y^2)-(3x+9y)

=(x-3y)*(x+3y)-3(x+3y)

=(x+3y)(x-3y-3)

e: \(=\left(x^2y-x^3\right)-\left(10y-10x\right)\)

\(=x^2\left(y-x\right)-10\left(y-x\right)\)

=(y-x)(x^2-10)