a) 20x - 5y

= 5(4x - y)

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

= 2x(x - 1)

c) x(x + y) - 6x - 6y

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

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

= (x + y)(x - 6)

d) 6x³ - 9x²

= 3x²(2x - 3)

e) 4x²y - 8xy² + 10x²y²

= 2xy(2x - 4y + 5xy)

g) 20x²y - 12x³

= 4x²(5y - 3x)

h) 8x⁴ + 12x²y⁴ - 16x³y⁴

= 4x²(2x² + 3y⁴ - 4xy⁴)

k) 4xy² + 8xyz

= 4xy(y + 2z)

giúp mình vs ạ c ơn nhiều

where is đề

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

b) 5x(x-1)-3x(x-1)=(5x-3x)(x-1)=2x(x-1)

c) x(x+y)-6x-6y=x(x+y)-(6x+6y)=x(x+y)-6(x+y)=(x-6)(x+y)

d) 6x³-9x²=3x²(2x-3)

e) 4x²y - 8xy² + 10x²y²=2xy(2x-4y+5xy)

g) 20x²y-12x³=4x²(5y-3x)

h) 8x⁴+ 12x²y⁴- 16x³y⁴ = 4x²(2x²+3y⁴-4xy⁴)

k) 4xy² + 8xyz=4xy(y+2z)

l) 3x(x + 1) - 5y( x + 1 )=(x+1)(3x-5y)

m) 4x²-1=(2x-1)(2x+1)

o) 9-(x-y)²=(3-x+y)(3+x-y)

p) x³+27=(x+3)(x²+3x+9)

n) (x-y)²-4=(x-y-2)(x-y+2)

r) x⁴ + 2x² + 1=(x⁴+x²)+(x²+1)=x²(x²+1)+(x²+1)=(x²+1)²

s) 4x²  - 12xy + 9y²  = (2x-3y)²

t) x² - x - y² - y =(x²-y²)-(x+y)=(x-y)(x+y)-(x+y)=(x+y)(x-y-1)

v) x³ - x + y³ - y = (x³+y³)-(x+y)=(x+y)(x²-xy+y²)-(x+y)=(x+y)(x²-xy+y²-1)

a: \(20x-5y=5\left(4x-y\right)\)

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

c: \(x\left(x+y\right)-6x-6y=\left(x+y\right)\left(x-6\right)\)

d: \(6x^3-9x^2=3x^2\left(x-3\right)\)

e: \(4x^2y-8xy^2+10x^2y^2=2xy\left(2x-4y+5xy\right)\)

4x²y-8xy²+18x²y²=2xy(2x-4y+9xy)

\(4x^2y-8xy^2+18x^2y^2=2xy\left(2x-4y+9xy\right)\)

\(4x^2y-8xy^2+18x^2y^2\)

\(=2xy\left(2x-4y+9xy\right)\)

a) \(5x-20y\)

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

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

\(=2x\left(x-1\right)\) 

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

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

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

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

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

= 2x ( x - 1 )

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

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

= ( x - 5 ) (x + y )

d ) x ^ 2 + xy + x

= x ( x + y + 1 )

e ) x ( x - y ) + y ( y - x )

= x ( x - y ) - y ( x - y )

= ( x - y ) ( x -y )

= ( x - y ) ²

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

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

c, x²+xy+x=x(x+y+1)

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

b)5x(x-1)-3x(x-1)=x(x-1).(5-3)=x(x-1).2

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

d)x^2+xy+x=x(x+y+1)

e)x(x-y)+y(y-x)=x(x-y)-(x-y).y=(x-y).(x-y)

a, \(\left(3x-6y\right)x+y\left(x-2y\right)=\left(3x+y\right)\left(x-2y\right)\)

b, \(3\left(x-y\right)-5x\left(y-x\right)=\left(3+5x\right)\left(x-y\right)\)

c, \(\dfrac{2}{5}x\left(y-1\right)+\dfrac{2}{5}y\left(1-y\right)=\left(\dfrac{2}{5}x-\dfrac{2}{5}y\right)\left(y-1\right)=\dfrac{2}{5}\left(x-y\right)\left(y-1\right)\)

d, \(x\left(x-1\right)-y\left(1-x\right)=\left(x+y\right)\left(x-1\right)\)

Ta có: 

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

b) 5x(x - 1) - 3x(x - 1) = x(x - 1)2

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

d) x² - 9 = (x - 3)(x + 3)

e) 4² - 25 = (4 - 5)(4 + 5) f) x⁶ - y⁶ = (x⁴)² - (y⁴)² = (x⁴ - y⁴)(x⁴ + y⁴) 

a)  5x - 20y = 5( x - 4y)

b) 5x(x-1) - 3x(x-1) =2x (x-1) 

c) x² - 9 = x² - 3² = ( x-3)(x+3)

e) 4²-25 = 4² - 5² = ( 4-5)(4+5)= -9

f) x⁶ - y⁶ = (x³)² - (y³)² = ( x³ - y³ ) ( x³ + y³)

                                    = (x-y) ( x² + xy + y² ) ( x+y) ( x² -xy +y²)

mình làm thiếu câu c ) x(x+y) - 5x-5y 

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

                                    = (x+y) ( x-5)