Phân tích đa thức thành nhân tử:
-8x2y2 - 12xy2 - 4xy2
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x 3 – 6 x 2 y + 12 x y 2 – 8 y 3 = x 3 – 3 . x 2 . ( 2 y ) + 3 . x . ( 2 y ) 2 – ( 2 y ) 3 = ( x – 2 y ) 3
đáp án cần chọn là: D
\(=2xy\left(x^2-y^2-2y-1\right)\)
\(=2xy\left[x^2-\left(y^2+2y+1\right)\right]\)
\(=2xy\left[x^2-\left(y+1\right)^2\right]\)
\(=2xy\left(x-y-1\right)\left(x+y+1\right)\)
\(2x^3y-2xy^3-4xy^2-2xy\)
\(=2xy\left(x^2-y^2-2y-1\right)\)
\(=2xy\left[x^2-\left(y+1\right)^2\right]\)
\(=2xy\left(x-y-1\right)\left(x+y+1\right)\)
2x3y – 2xy3 – 4xy2 – 2xy
= 2xy(x2 - y2 - 2y - 1)
= 2xy[x2 - (y2 + 2y + 1)]
= 2xy[x2 - (y + 1)2 ]
= 2xy(x + y + 1)(x - y - 1)
2 x 3 y – 2 x y 3 – 4 x y 2 – 2 x y = 2 x y ( x 2 – y 2 – 2 y – 1 ) = 2 x y [ x 2 – ( y 2 + 2 y + 1 ) ] = 2 x y [ x 2 – ( y + 1 ) 2 ]
= 2xy(x – y – 1)(x + y + 1)
Đáp án cần chọn là: A
1, \(xy^3-x^3y=xy\left(y^2-x^2\right)=xy\left(y-x\right)\left(x+y\right)\)
2, \(5x\left(3y+4x-6\right)\)
3, \(3x\left(2-y\right)\)
4, \(x\left(x^2+2x+1\right)=x\left(x+1\right)^2\)
5, \(x\left(4x^2-12x+9\right)=x\left(2x-3\right)^2\)
6, \(2xy\left(x+2y-5x^2y\right)\)
7, \(x^2\left(x^2+2x+1\right)=x^2\left(x+1\right)^2\)
11, \(\left(x+y\right)\left(x-1\right)\)
\(1,xy^3-x^3y=xy\left(y^2-x^2\right)=xy\left(y-x\right)\left(y+x\right)\\ 2,15xy+20x^2-30x=5x\left(3y+4x-6\right)\\ 3,6x-3xy=3x\left(2-y\right)\\ 4,x^3+2x^2+x=x\left(x^2+2x+1\right)=x\left(x+1\right)^2\\ 5,4x^3-12x^2+9x=x\left(4x^2-12x+9\right)=x\left(2x-3\right)^2\\ 6,2x^2y+4xy^2-10x^3y^2=2xy\left(x+2y-5x^2y\right)\\ 11,x\left(x-1\right)-y\left(1-x\right)=x\left(x-1\right)+y\left(x-1\right)=\left(x-1\right)\left(x+y\right)\)
\(-8x^2y^2-12xy^2-4xy^2=-8x^2y^2-16xy^2\)
\(=-8xy^2\left(x+2\right)\)
-8x2y2 - 12xy2 - 4xy2
\(=-4xy\left(2xy+3y+y\right)\)