a: \(=5xy\left(x-3y+2\right)\)
b: \(=x\left(y+z\right)+3\left(y+z\right)=\left(y+z\right)\left(x+3\right)\)
c: \(=\left(x+2\right)^2-4y^2=\left(x+2+2y\right)\left(x+2-2y\right)\)
d: \(\Leftrightarrow x^2-4x-5-x^2+2x=1\)
=>-2x=6
=>x=-3
e: =>(x-5)(2x+3)=0
=>x=-3/2 hoặc x=5