Answer:

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

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

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

\(=x[\left(x-1\right)^2-y^2]\)

\(=x\left(x-1-y\right)\left(x-1+y\right)\)

4x(4x+1)-3  

\(4x^2+4x-3\)

\(=4x^2+6x-2x-3\)

\(=\left(4x^2+6x\right)-\left(2x+3\right)\)

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

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

Trả lời:

7x² - 7y² - 14x + 14y 

= 7 ( x² - y² - 2x + 2y )

= 7 [ ( x² - y² ) - ( 2x - 2y ) ] 

= 7 [ ( x - y )( x + y ) - 2 ( x - y ) ]

= 7 ( x - y )( x + y - 2 )

\(x^8+3x^4+4\)

\(=\left(x^8-x^6+2x^4\right)+\left(x^6-x^4+2x^2\right)+\left(2x^4-2x^2+4\right)\)

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

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

\(4x^4+4x^3+5x^2+2x+1\)

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

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

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

thôi mk ko cần nữa

\(x^2-5x+6\)

\(=x^2-5x+\frac{25}{4}-\frac{1}{4}\)

\(=\left(x-\frac{5}{2}\right)^2-\left(\frac{1}{2}\right)^2\)

\(=\left(x-\frac{5}{2}-\frac{1}{2}\right)\left(x-\frac{5}{2}+\frac{1}{2}\right)\)

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

\(x^2-5x+6 \)

= \(x^2-2x-3x+6\)

= \(\left(x^2-2x\right)-\left(3x-6\right)\)

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

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

Trả lời:

a) \(\frac{1}{4}x^2y+5x^3-x^2y^2=x^2\left(\frac{1}{4}y+5x-y^2\right)\)

 b) 5x ( x - 1 ) - 3y ( 1 - x ) = 5x ( x - 1 ) + 3y ( x - 1 ) = ( x - 1 )( 5x + 3y )

 c) 4x² - 25 = ( 2x )² - 5² = ( 2x - 5 )( 2x + 5 )

 d) 6x- 9x² = 3x ( 2 - 3x )