Question

chỉ làm bài 2 thôi

 

Answer 1

2:

a: =3x^2-3xy-(5x-5y)

=3x(x-y)-5(x-y)

=(x-y)(3x-5)

b: =6x(2x-y)-3y(2x-y)

=(2x-y)(6x-3y)

=3(2x-y)^2

c: =x(a-b)-y(a-b)

=(a-b)(x-y)

d: =x^2(a-b)-y^2(a-b)

=(a-b)(x^2-y^2)

=(x-y)(x+y)(a-b)

e: \(=6y\left(2x^2-3xy-5y^2\right)\)

=6y(2x^2-5xy+2xy-5y^2)

=6y[x(2x-5y)+y(2x-5y)]

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

f: =5x(x-y)-10(x-y)

=(x-y)(5x-10)

=5(x-2)(x-y)

g: =3x-4x+3y-4y

=-x+y

h: =7x(x-y)+(x-y)

=(x-y)(7x+1)

k: =(5x)^2-(3x+3y)^2

=(5x-3y-3x)(5x+3x+3y)

=(8x+3y)*(2x-3y)