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\(4x^2\left(x+y\right)-x-y\)
\(=4x^2\left(x+y\right)-\left(x+y\right)\)
\(=\left(x+y\right)\left(4x^2-1\right)\)
\(=\left(x+y\right)\left(2x-1\right)\left(2x+1\right)\)
\(16ty^2+6xt-9t-tx^2\)
\(=t.\left(16y^2+6x-9-x^2\right)\)
\(=t.\left[\left(4y\right)^2-\left(x^2-2.x.3+3^2\right)\right]\)
\(=t.\left[\left(4y\right)^2-\left(x-3\right)^2\right]\)
\(=t.\left(4y-x+3\right)\left(4y+x-3\right)\)
\(x^2-9xy+20y^2\)
\(=\left(x^2-4xy\right)-\left(5xy-20y^2\right)\)
\(=x.\left(x-4y\right)-5y\left(x-4y\right)\)
\(=\left(x-4y\right)\left(x-5y\right)\)
\(x^2+xy-20y^2\)
\(=x^2+2.x.\frac{1}{2}y+\frac{1}{4}y^2-20y^2-\frac{1}{4}y^2\)
\(=\left(x+\frac{1}{2}y\right)^2-\frac{79}{4}\)
\(=\left(x+\frac{1}{2}y-\frac{\sqrt{79}}{2}\right)\left(x+\frac{1}{2}y+\frac{\sqrt{79}}{2}\right)\)
\(5y^3-10xy^2+5yx^2-20y=5y\left(y^2-2xy+x^2-4\right)\)
\(=5y\left[\left(x+y\right)^2-4\right]\)
\(=5y\left(x+y-2\right)\left(x+y+2\right)\)
Chúc bạn học tốt.
a)4x^2 + y^2 - 4xy - 9t^2 = (2x)^2 - 4xy + y^2 - 9t^2
= (2x - y)^2 - (3t )^2
= ( 2x -y -3t ) ( 2x - y+ 3t)
a) x2 - xy - 20y2
= x2 + 4xy - 5xy - 20y2
= x( x + 4y ) - 5y( x + 4y )
= ( x + 4y )( x - 5y )
b) x3 - x2y - 3xy2 + 2y3
= x3 + x2y - 2x2y - xy2 - 2xy2 + 2y3
= ( x3 + x2y - xy2 ) - ( 2x2y + 2xy2 - 2y3 )
= x( x2 + xy - y2 ) - 2y( x2 + xy - y2 )
= ( x2 + xy - y2 )( x - 2y )