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28 tháng 9 2015

=3x2+21xy+6x+xy+7y2+2y+5x+35y+10

=3x.(x+7y+2)+y.(x+7y+2)+5.(x+7y+2)

=(x+7y+2)(3x+y+5)

29 tháng 7 2015

x^3 - x + 3x^2y + 3xy^2 + y^3 - y

=x3+y3+3x2y+3xy2-x-y

=(x+y)(x2-xy+y2)+3xy(x+y)-(x+y)

=(x+y)(x2-xy+y2+3xy-1)

=(x+y)(x2+2xy+y2-1)

=(x+y)[(x+y)2-1]

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

 

x^2 + 5x - 6

=x2-x+6x-6

=x.(x-1)+6.(x-1)

=(x-1)(x+6)

 

16 tháng 9 2021

a) \(-y^2+\dfrac{1}{9}\)

\(=-\left(y^2-\left(\dfrac{1}{3}\right)^2\right)\)

\(=-\left(y+\dfrac{1}{3}\right)\left(y-\dfrac{1}{3}\right)\)

b) \(4^4-256\)

\(=4^4-4^4\)

\(=0\)

16 tháng 9 2021

c) \(9\left(x-3\right)^2-4\left(x+1\right)^2\)

\(=\left(3x-9\right)^2-\left(2x+2\right)^2\)

\(=\left(3x-9+2x+2\right)\left(3x-9-2x-2\right)\)

\(=\left(5x-7\right)\left(x-11\right)\)

29 tháng 11 2018

x3-x+3x2y+3xy2+y3-y

=x2(x-1)+3(x2y+xy2)+y2(y-1)

=x2(x-1)+3(x2.y+y2.x)+y2(y-1)

=x2(x-1)+3{[x(x+1)+y(y+1)]}+y2(y-1)

=x2(x-1)+3.x(x+1)+3.y(y+1)+y2(y-1)

=x2(x-1)+2x2+3.x(x+1)+3.y(y+1)+y2(y-1)+2y2-2x2-2y2

=x2(x+1)+3.x(x+1)+3.y(y+1)+y2(y+1)-2x2-2y2

=(x2+3)(x+1)+(y2+3)(y+1)-2(x2+y2)

29 tháng 11 2018

ta có : (x*3+3x*2y+3xy*2+y*3)-(x+y)

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

=(x+y)((X+Y)*2-1)

(x+y)(x+y+1)(x+Y-1)

5 tháng 8 2017

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

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

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

21 tháng 11 2018

(*)\(3x^2-11x+6=3x^2-2x-9x+6=x\left(3x-2\right)-3\left(3x-2\right)=\left(x-3\right)\left(3x-2\right)\)

(*)\(x^2-6x+5=x^2-x-5x+5=x\left(x-1\right)-5\left(x-1\right)=\left(x-5\right)\left(x-1\right)\)

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

(*)\(x^4-4x^2+3=x^4-x^2-3x^2+3=x^2\left(x^2-1\right)-3\left(x^2-1\right)=\left(x+1\right)\left(x-1\right)\left(x^2-3\right)\)

(*)\(6x^2+7xy+2y^2=6x^2+4xy+3xy+2y^2=2x\left(3x+2y\right)+y\left(3x+2y\right)=\left(2x+y\right)\left(3x+2y\right)\)

21 tháng 11 2018

a, \(3x^2-11x+6=3x^2-2x-9x+6=x\left(3x-2\right)-3\left(3x-2\right)=\left(3x-2\right)\left(x-3\right)\)

b, \(x^2-6x+5=x^2-x-5x+5=x\left(x-1\right)-5\left(x-1\right)=\left(x-1\right)\left(x-5\right)\)

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

d, \(x^4-4x^2+3=x^4-4x^2+4-1=\left(x^2-2\right)^2-1=\left(x^2-1\right)\left(x^2-3\right)=\left(x+1\right)\left(x-1\right)\left(x^2-3\right)\)

e, \(6x^2+7xy+2y^2=6x^2+3xy+4xy+2y^2=3x\left(2x+y\right)+2y\left(2x+y\right)=\left(2x+y\right)\left(3x+2y\right)\)