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a: \(9x^3y^2+3x^2y^2\)
\(=3x^2y^2\cdot3x+3x^2y^2\cdot1\)
\(=3x^2y^2\left(3x+1\right)\)
b: \(x^2-2x+1-y^2\)
\(=\left(x^2-2x+1\right)-y^2\)
\(=\left(x-1\right)^2-y^2\)
\(=\left(x-1-y\right)\left(x-1+y\right)\)
a) \(x^3-16x=x\left(x^2-4\right)=x\left(x-2\right)\left(x+2\right)\)
b) \(3x^2+3y^2-6xy-12=3\left(x^2-2xy+y^2-4\right)=3\left(x-y-2\right)\left(x-y+2\right)\)
c) \(x^2+6x+5=\left(x+1\right)\left(x+5\right)\)
d) \(x^4+x^3+2x^2+x+1=x^2\left(x^2+x+1\right)+\left(x^2+x+1\right)=\left(x^2+x+1\right)\left(x^2+1\right)\)
Ta có 3x(x – 3y) + 9y(3y – x)
= 3x(x – 3y) – 9y(x – 3y) = (x – 3y)(3x – 9y)
= (x – 3y).3(x – 3y) = 3 ( x – 3 y ) 2
Đáp án cần chọn là: A
e) \(8\left(x+3y\right)-16x\left(x+3y\right)=\left(x+3y\right)\left(8-16x\right)=8\left(x+3y\right)\left(1-2x\right)\)
f) \(4x^2\left(x+1\right)+2x^2\left(x+1\right)=\left(x+1\right)\left(4x^2+2x^2\right)=6x^2\left(x+1\right)\)
g) \(3\left(x-y\right)-5x\left(y-x\right)=3\left(x-y\right)+5x\left(x-y\right)=\left(3+5x\right)\left(x-y\right)\)
a) x3-2x2-x+2
=x(x2-1)+2(-x2+1)
=x(x2-1)-2(x2-1)
=(x2-1)(x-2)
b)
x2+6x-y2+9
=x2+6x+9-y2
=(x+3)2-y2
=(x+3-y)(x+3+y)
x(y - z) + 2(z - y)
= x(y - z) - 2(y - z)
= (x - 2)(y - z)
(2x - 3y)(x - 2) - (x + 3)(3y - 2x)
= (2x - 3y)(x - 2) + (x + 2)(2x - 3y)
= (2x - 3y)(x - 2 + x + 2)
= 2x(2x - 3y)
\(x^4+x^3y-4x-4y\) (sửa \(x^3\rightarrow x^4\))
\(=x^3\left(x+y\right)-4\left(x+y\right)\)
\(=\left(x+y\right)\left(x^3-4\right)\)
\(=\left(x+y\right)\left(x^2-xy+y^2\right)-4\left(x+y\right)=\)
\(=\left(x+y\right)\left(x^2-xy+y^2-4\right)\)
6a( x - 3y ) - 8b( 3y - x )
= 6a( x - 3y ) + 8b( x - 3y )
= 2( x - 3y )( 3a + 4b )
\(6a\left(x-3y\right)-8b\left(3y-x\right)\)
\(=6a\left(x-3y\right)+8b\left(x-3y\right)\)
\(=\left(6a+8b\right)\left(x-3y\right)=2\left(3a+4b\right)\left(x-3y\right)\)