a) \(=3\left(x-2\right)\)

b) \(=2\left(x+5\right)\)

c) \(=x\left(x-3\right)\)

d) \(=\left(x-3\right)\left(2x+7\right)\)

e) \(=\left(x-1\right)\left(3x+2\right)\)

f) \(=x\left(x+2\right)\left(x-5\right)\)

\(x^3+2x^2+3x\)

\(=x\left(x^2+2x+3\right)\)

#Ayumu

a) Ta có: \(4x\left(2y-z\right)+7y\left(z-2y\right)\)

        \(=4x\left(2y-z\right)-7y\left(2y-z\right)\)

        \(=\left(4x-7y\right)\left(2y-z\right)\)

b) Ta có: \(2x\left(x+3\right)+\left(3+x\right)\)

        \(=\left(2x+1\right)\left(x+3\right)\)

c) Ta có: \(3x\left(2x-1\right)+7x^2\left(1-2x\right)\)

        \(=3x\left(2x-1\right)-7x^2\left(2x-1\right)\)

        \(=\left(3x-7x^2\right)\left(2x-1\right)\)

\(a,2x^2+3x-2xy-3y\)

\(=x\left(2x+3\right)-y\left(2x+3\right)\)

\(=\left(2x+3\right)\left(x-y\right)\)

\(b,x^3-4x^2+4x\)

\(=x\left(x^2-4x+4\right)\)

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

#Urushi

a) \(2x^2+3x-2xy-3y\)

\(\text{=}2x\left(x-y\right)+3\left(x-y\right)\)

\(\text{=}\left(2x+3\right)\left(x-y\right)\)

b) \(x^3-4x^2+4x\)

\(\text{=}x\left(x^2-4x+4\right)\)

\(\text{=}x\left(x-2\right)^2\)

cái này trong sách í

8: \(=\left(x-2y\right)\cdot x\cdot\left(x+3\right)\)

9: \(=\left(5x+2\right)\left(x-3\right)-x\left(x-3\right)\)

\(=\left(x-3\right)\left(4x+2\right)\)

=2(2x+1)(x-3)

3: \(=2\left(x+2\right)\left(25x-15-x\right)\)

\(=2\left(x+2\right)\left(24x-15\right)\)

=6(x+2)(8x-5)

x³-2x²-5x=x(x²-2x-5)

\(x^3-2x^2-5x=x\left(x^2-2x-5\right)\)