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x6+3x4y2-8x3y3+3x2y4+y6= x6+3x4y2+3x2y4+y6-8x3y3=(x2+y2)3-(2xy)3
= (x2+y2-2xy)[(x2+y2)2+2xy(x2+y2)+(2xy)2]= (x-y)2(x4+6x2y2+y4+2x3y+2xy3)
(x2+y2-5)2-4x2y2-16xy-16=(x2+y2-5)2-(4x2y2+16xy+16)=(x2+y2-5)2-(2xy+4)2
=(x2+y2-5+2xy+4)(x2+y2-5-2xy-4)=(x2+2xy+y2-1)(x2-2xy+y2-9)=[(x+y)2-1][(x-y)2-32]=(x+y-1)(x+y+1)(x-y-3)(x-y+3)
x4+324=x4+36x2+324-36x2=(x2+18)2-(6x)2=(x2+18-6x)(x2+18+6x)
( a - x )y3 - ( a - y )x3 + ( x - y )a3
= ay3 + a2y2 - ax2y - a2xy - a2y2 - a3y + a2x2 + a3x - xy3 - axy2 + x3y + ax2y + axy2 + a2xy - ax3 - a2x2
= ay( y2 +ay -x2 - ax ) - a2( y2 + ay -x2 -ax ) - xy( y2 + ay - x2 -ax ) + ax( y2 + ay -x2 -ax )
= ( y2 + ay - x2 - ax )( ay - a2 - xy + ax )
= ( y2 + xy +ay -xy -ax -x2 )[ ( y -a )a - x( y-a ) ]
= [ y( y +x +a ) - x( y + x + a )]( a - x )( a - y)
= ( y + x + a)( y -x )( a - x)( y - a)
\(\left(x-y\right)z^3+\left(y-z\right)x^3+\left(z-x\right)y^3\)
\(=\left(x-y\right)z^3-\left[\left(x-y\right)+\left(z-x\right)\right]x^3+\left(z-x\right)y^3\)
\(=\left(x-y\right)z^3-\left(x-y\right)x^3-\left(z-x\right)x^3+\left(z-x\right)y^3\)
\(=\left(x-y\right)\left(z^3-x^3\right)-\left(z-x\right)\left(x^3-y^3\right)\)
\(=\left(x-y\right)\left(z-x\right)\left(z^2+zx+x^2\right)-\left(z-x\right)\left(x-y\right)\left(x^2+xy+y^2\right)\)
\(=\left(x-y\right)\left(z-x\right)\left(z^2+zx+x^2-x^2-xy-y^2\right)\)
\(=\left(x-y\right)\left(z-x\right)\left[\left(x^2-x^2\right)+\left(zx-xy\right)+\left(z^2-y^2\right)\right]\)
\(=\left(x-y\right)\left(z-x\right)\left[x\left(z-y\right)+\left(z-y\right)\left(y+z\right)\right]\)
\(=\left(x-y\right)\left(z-x\right)\left(z-y\right)\left(x+y+z\right)\)
\(=-\left(x-y\right)\left(y-z\right)\left(z-x\right)\left(x+y+z\right)\)
A=x^3y(x^4+x^2+1)
Hết
x7y+x5y+x3y=x3y.(x4+x2+1)
=x3y.(x4+2x2+1-x2)
=x3y.[(x2+1)2-x2]
=x3y.(x2-x+1)(x2+x+1)