đặt 3 xy làm chung nha bn ...

~ hok tốt ~

chung 3xy nhek

\(3x^3y-6x^2y-3xy^3-6xy^2z-3xyz^2+3xy\)

\(=3xy\left(x^2-2x-y^2-2yz-x^2+1\right)\)

\(=3xy\left(\left(x^2-2x+1\right)-\left(y^2+2yz+z^2\right)\right)\)

\(=3xy\left(\left(x-1\right)^2-\left(y-z\right)^2\right)\)

\(=3xy\left(x-1+y-z\right)\left(x-1-y+z\right)\)

\(x^2+3x-10\)

\(=x^2-2x+5x-10\)

\(=x\left(x-2\right)-5\left(x-2\right)\)

\(=\left(x-2\right)\left(x-5\right)\)

hk tốt

^^

dài quá mình làm 3 câu đầu thôi nhé!

a)7x^2-14xy

=7x(x-2y)

b) 3x^2-6xy+3y^2

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

c) x^2-4z^2-2xy+y^2

=(x^2-2xy+y^2)-4z^2

=(x-y-2z)(x-y+2z)

=3(x-y)^2

c) 

3x³ + 6x²y+ 3xy²

=3x³ + 3x²y + 3x²y + 3xy²

= 3x²(x +y) + 3xy(x +y)

=(x+y)(3x² + 3xy)

= 3x(x+y)(x+y)

= 3x(x+y)²

Chon D

D

b)x²+2xy+y²-16=(x+y)²-4²=(x+y+4)(x+y-4)

c)3x²+5x-3xy-5y=x(3x+5)-y(3x+5)=(3x+5)(x-y)

d)4x²-6x³y-2x²+8x=2x(2x-3x²y-x+4)

e)x²-4-2xy+y²=(x²-2xy+y²)-4=(x-y)²-2²=(x-y-2)(x-y+2)

k)x²-y²-z²-2yz=x²-(y+z)²=(x-y-z)(x+y+z)

m)6xy+5x-5y-3x²-3y²=3(x²-2xy+y²)+5(x-y)=3(x-y)²+5(x-y)=(x-y)(3x-3y+5)

b. (x^2+2xy+y^2)-16 =(x+y)^2-16=(x+y+4)(x+y-4)

a: =-2x^2y^3z^2

Hệ số: -2

bậc: 7

b: =-1/3x^3y^3

hệ số: -1/3

bậc: 6

c: =-1/2x^6y^5

hệ số: -1/2

bậc: 11

d: =-2/3x^3y^4

hệ số: -2/3

bậc: 7

e: =3/4x^3y^4

hệ số:3/4

bậc: 7

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

\(=2\left(x-y\right)-\left(x-y\right)^2\)

\(=\left(x-y\right)\left(2-x+y\right)\)

b) \(x^3-x+3x^2y+3xy^2+y^3-y\)

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

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

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

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