\(\left(x-y\right)^3-x^3+y^3=\left(x-y\right)^3-\left(x^3-y^3\right)=\left(x-y\right)^3-\left(x-y\right)\left(x^2+xy+y^2\right)=\left(x-y\right)\left(x^2-2xy+y^2-x^2-xy-y^2\right)=-3xy\left(x-y\right)\)

\(\left(x-y\right)^3-x^3+y^3\\ =\left(x-y\right)^3-\left(x^3-y^3\right)\\ =\left(x-y\right)^3-\left(x-y\right)\left(x^2+xy+y^2\right)\\ =\left(x-y\right)\left[\left(x-y\right)^2-\left(x^2+xy+y^2\right)\right]\\ =\left(x-y\right)\left(x^2-2xy+y^2-x^2-xy-y^2\right)\\ =\left(-3xy\right)\left(x-y\right)\)

\(\left(x-y\right)^3-x^3+y^3\)

\(=x^3-3x^2y+3xy^2-y^3-x^3+y^3\)

\(=-3x^2y+3xy^2\)

\(=-3xy\left(x-y\right)\)

a:

=x(x²-y²-10x+25)

=x((x²-10x+25)-y²)

=x((x-5)²-y²)

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

b

=>8x(x-5)-3(x-5)=0

=>(x-5)(8x-3)=0

x-5=0=>x=5 hoặc 8x-3=0=>x=3/8

a) 3xy² - 3x³ - 6xy + 3x 

=3x (y² - x² - 2y +1)

= 3x [ (y-1)² -x² ]

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

b) 3x² +11x+6

= 3 x² +9x +2x +6

=3x (x+3)+2(x+3)

= (x+3)(3x+2)

c) -x³ - 4xy² + 4x²y +16x

= -x (x² + 4y² - 4xy -16 )

= -x [(x -2y)² - 4² ]

= -x(x-2y-4)(x-2y+4) 

a) Ta có: \(x^2-3x+xy-3y\)

\(=x\left(x-3\right)+y\left(x-3\right)\)

\(=\left(x-3\right)\left(x+y\right)\)

b) Ta có: \(x^3+10x^2+25x-xy^2\)

\(=x\left(x^2+10x+25-y^2\right)\)

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

c) Ta có: \(x^3+2+3\left(x^3-2\right)\)

\(=4x^3-4\)

\(=4\left(x-1\right)\left(x^2+x+1\right)\)

1a) \(=-\left(x^3-3x^2+3x-1\right)=-\left(x-1\right)^3\)

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

\(a,=-\left(x-1\right)^3\left[=\left(1-x\right)^3\right]\\ b,=\left(1-x\right)^3\)

a. \(=-\left(x^3-3x^2+3x-1\right)=-\left(x-1\right)^3\)

b. \(=\left(1-x\right)^3\)

\(c,=x^4+2x^2+1-x^2=\left(x^2+1\right)-x^2=\left(x^2+x+1\right)\left(x^2-x+1\right)\)

chỉnh lại đề nè:không có chữ chung nhé

Mk mới lớp 7 thui nên mình ko làm đc bài này.

a) \(5x^3-10x^2+15x=5x\left(x^2-2x+3\right)\)

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

a: \(=5x\left(x^2-2x+3\right)\)

b: =(x-1)(x-2)