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a/ \(=3y^2-6y-2x+1\)
b/ \(=-\left(x^3-3x^2+3x-1\right)=-\left(x-1\right)^3\)
c/ \(=\left(2-x\right)^3\)
d/ \(=xy^2+x^2y+3xy+x^2y+x^3+3x^2-3xy-3x^2-9x\)
\(=xy\left(y+x+3\right)+x^2\left(y+x+3\right)-3x\left(y+x+3\right)\)
\(=\left(xy+x^2-3x\right)\left(y+x+3\right)=x\left(y+x-3\right)\left(y+x+3\right)\)
e/ \(=xy-x^2+2x-y^2+xy-2y\)
\(=x\left(y-x+2\right)-y\left(y-x+2\right)=\left(x-y\right)\left(y-x+2\right)\)
a) =(2x+3y-1)2
b)=-(x-1)3
c)=-(x3-6x2+12x-8)=-(x-2)3
d)x3 + 2x2y + xy2 – 9x
= x(x2 + 2xy + y2 -9)
= x[(x2 + 2xy + y2) - 32]
= x[(x + y)2 - 32]
= x (x + y – 3)(x + y + 3)
e) 2x-2y-x2+2xy-y2=2(x-y)-(x-y)2=(x-y)(2-x+y)
Ta có
\(x^3-6x^2+x^2y+9x-3y\\ =\left(x^3-6x^2+9x\right)+\left(x^2y-3y\right)\\ =x\left(x^2-3\right)^2+y\left(x^2-3\right)\)
=(x^2-3)(x+y)
a.\(2xy^2-x^2y-y^3=y\left(2xy-x^2-y^2\right)\)
\(=-y\left(x^2-2xy+y^2\right)\)
\(=-y\left(x-y\right)^2\)
b.\(x^2-6x+8=x^2-2x-4x+8=x\left(x-2\right)-4\left(x-2\right)=\left(x-4\right)\left(x-2\right)\)
\(a,y-x^2y+2xy^2-y^3=y(1-x^2+2xy-y^2) =y[1-(x^2-2xy+y^2)]=y[1-(x-y)^2] =y(1-x+y)(1+x-y) =y(x+y-1)(x-y+1) \)
a) x3 + 6x2 + 9x
= x(x2 + 6x + 9)
= x(x + 3)2
b) x2 - 2xy + y2 - (x - y)(3y - x)
= (x - y)2 - (x - y)(3y - x)
= (x - y)(x - y - 3y + x)
= (x - y)(2x - 4y) = 2(x - y)(x - 2y)