bài 1 :
a) 20x - 5y b) 5x ( x - 1 ) - 3x ( x - 1 )
c) x ( x + y ) - 6x - 6y d) 6x3 - 9x2 e) 4x2y - 8xy2 + 10x2y2
g) 20x2y - 12x3 h) 8x4+ 12x2y4- 16x3y4 k) 4xy2 + 8xyz
l) 3x(x + 1) - 5y( x + 1 ) m) 4x2 - 1 o) 9 - ( x - y )2
p) x3 + 27 n) ( x-y )2 - 4 r)x4 + 2x2 + 1
s) 4x2 - 12xy + 9y2 t) x2 - x - y2 - y u) x2 - 2xy + y2 - z2
v) x3 - x + y3 - y
GIẢI HỘ TUI VỚI Ạ
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: \(4x^2y-8xy^2+10x^2y^2=2xy\left(2x-4y+5xy\right)\)
m: \(4x^2-1=\left(2x-1\right)\left(2x+1\right)\)
o: \(9-\left(x-y\right)^2=\left(3-x+y\right)\left(3+x-y\right)\)
p: \(x^3+27=\left(x+3\right)\left(x^2-3x+9\right)\)
n: \(\left(x-y\right)^2-4=\left(x-y-2\right)\left(x-y+2\right)\)
r: \(x^4+2x^2+1=\left(x^2+1\right)^2\)
s: \(4x^2-12xy+9y^2=\left(2x-3y\right)^2\)
t: \(x^2-y^2-x-y=\left(x+y\right)\left(x-y-1\right)\)
