Question

Phân tích thành nhân tử :

a) \(5x-20y\)

b) \(5x\left(x-1\right)-3x\left(x-1\right)\)

c) \(x\left(x+y\right)-5x-5y\)

Answer 1

a) \(5x-20y\\ =5\left(x-4y\right)\)

b) \(5x\left(x-1\right)-3x\left(x-1\right)\\ =\left(5x-3x\right)\left(x-1\right)\\ =2x\left(x-1\right)\)

c) \(x\left(x+y\right)-5x-5y\\ =x\left(x+y\right)-\left(5x+5y\right)\\ =x\left(x+y\right)-5\left(x+y\right)\\ =\left(x+y\right)\left(x-5\right)\)

Answer 2

a) 5x-20y=5(x-4y)

b) 5x(x-1)-3x(x-1)

= (x-1)(5x-3x)

c) x(x+y)-5x-5y

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

=(x+y)(x-5)

Answer 3

a) 5x - 20y = 5(x - 4y)

b) 5x (x - 1) - 3x (x - 1) = (x - 1)(5x - 3x)

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

Answer 4

Đây ạ:

Answer 5

a) \(5x-20y=5\left(x-4y\right)\)

b) \(5x\left(x-1\right)-3x\left(x-1\right)\)

= \(\left(x-1\right)\left(5x-3x\right)\)

=\(2x\left(x-1\right)\)

c) \(x\left(x+y\right)-5x-5y\)

=\(x\left(x+y\right)-\left(5x+5y\right)\)

\(=x\left(x+y\right)-5\left(x+y\right)\)

\(=\left(x+y\right)\left(x-5\right)\)