\(2x^3-2xy^2-8x^2+8xy\)
\(=2x\left(x^2-y^2-4x+4y\right)\)
\(=2x\left[\left(x^2-y^2\right)-4\left(x-y\right)\right]\)
\(=2x\left[\left(x-y\right)\left(x+y\right)-4\left(x-y\right)\right]\)
\(=2x\left(x-y\right)\left(x+y-4\right)\)
2x^3 - 2xy^2 - 8x^2 + 8xy
= 2x^2 ( x - y ) - 8x ( x - y )
= ( x - y ) ( 2x^2 - 8x )
= ( x - y ) 2x ( x - 4 )
Trả lời:
2x3 - 2xy2 - 8x2 + 8xy
= 2x ( x2 - y2 - 4x + 4y )
= 2x [ ( x2 - y2 ) - ( 4x - 4y ) ]
= 2x [ ( x - y )( x + y ) - 4 ( x - y ) ]
= 2x ( x - y )( x + y - 4 )