Question

Answer 1

Câu 16:

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

b: =(x-3)^2-(x-3)

=(x-3)(x-3-1)

=(x-3)(x-4)

c: \(15x-3x^2+5xy-x^2y\)

\(=3x\left(5-x\right)+xy\left(5-x\right)=\left(5-x\right)\cdot x\cdot\left(3+y\right)\)

d: x^2-2x+2y-xy

=x(x-2)+y(2-x)

=(x-2)(x-y)

e: x^2+4xy+4y^2-4

=(x+2y)^2-4

=(x+2y+2)(x+2y-2)

f: 2x^2-8x

=2x(x-4)