bài 2
a)
5x(x - 1) - 3x(x - 1)
=(x-1)(5x-3x)
=2x(x-1)

bài 2
a)
5x(x - 1) - 3y(x - 1)
=(x-1)(5x-3y)

bài 1 :
a, 20x - 5y = 5.(4x - y)
b, 5x(x - 1) - 3x(x - 1)
= (x - 1)(5x - 3x) = 2x(x - 1)
e, 4x^2y - 8xy^2 + 10x^2y^2
= 2xy.(2x - 4y + 5xy)
c, x.(x + y) - 6x - 6y
= x.(x + y) - 6.(x + y)
= (x - 6).(x + y)
d, 6x^3 - 9x^2 = 3x^2.(2x - 3)

Bài 1 : bài đầu tiên
g, 20x^2y - 12x^3 = 4x^2.(5y - 3x)
h, 8x^4 + 12x^2y^4 - 16x^3y^4
= 4x^2.(2x^2 + 3y^4 - 4xy^4)
k, 4xy^2 + 8xyz = 4xy.(y + 2z)
Bài 2 :
a, 3x.(x + 1) - 5y.(x + 1)
= (3x - 5y).(x + 1)
b, 3x.(x - 6) - 2.(x - 6)
= (3x - 2).(x - 6)

Bài 2 :
c, 4y.(x - 1) - (1 - x)
= 4y.(x - 1) + (x - 1)
​= (4y + 1).(x - 1)
d, (x - 3)^3 + 3 - x
= (x - 3)^3 - (x - 3)
= (x - 3).[(x - 3)^2 - 1]
= (x - 3).(x - 3 - 1).(x - 3 + 1)
= (x - 3).(x - 4).(x - 2)
e, 7x.(x - y) - (y - x)
= 7x.(x - y) + (x - y)
= (7x + 1).(x - y)

Bài 3 :
b, x.(x - 1) - 2.(1 - x) = 0
<=> x.(x - 1) + 2.(x - 1) = 0
<=> (x + 2).(x - 1) = 0
<=> x + 2 = 0 hoặc x - 1 = 0
<=> x = - 2 hoặc x = 1
h, x^2 - 4x = 0
<=> x.(x - 4) = 0
<=> x = 0 hoặc x - 4 = 0
<=> x = 0 hoặc x = 4