Question

Làm 3, 4

Làm đc bài 5 càng tốt

Answer 1

Bài 3: 

a: \(x^3-x=x\left(x-1\right)\left(x+1\right)\)

b: \(x^3-4xy^2=x\left(x^2-4y^2\right)=x\left(x-2y\right)\left(x+2y\right)\)

c: \(25-4x^2=\left(5-2x\right)\left(5+2x\right)\)

d: \(x^3-2x^2+x=x\left(x^2-2x+1\right)=x\left(x-1\right)^2\)

e: \(4x^2y-y=y\left(4x^2-1\right)=y\left(2x-1\right)\left(2x+1\right)\)

f: \(9-\left(x+y\right)^2=\left(3-x-y\right)\left(3+x+y\right)\)