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\(\frac{x^3+3x^2+3x+2}{x^2+x+1}\)
\(=\frac{x.\left(x^2+x+1\right)+2.\left(x^2+x+1\right)}{x^2+x+1}\)
\(=\frac{\left(x^2+x+1\right)\left(x+2\right)}{x^2+x+1}\)
\(=x+2\left(x^2+x+1\ne0\right)\)
Tham khảo nhé~
Câu 1 :
\(2x^2\left(3x-5x^3\right)+10x^5-5x^3\)
\(=6x^3-10x^5+10x^5-5x^3\)
\(=x^3\)
Câu 2 :
\(\left(x+3\right)\left(x^2-3x+9\right)+\left(x-9\right)\left(x+3\right)\)
\(=x^3+3^3+\left(x^2+3x-9x-27\right)\)
\(=x^3+27+x^2-6x-27\)
\(=x^3+x^2-6x\)
a, (x4-2x3+2x-1):(x2-1) = \(\frac{\left(x^4-1\right)-\left(2x^3-2x\right)}{x^2-1}\)
= \(\frac{\left(x^2-1\right)\left(x^2+1\right)-2x\left(x^2-1\right)}{x^2-1}\) =\(\frac{\left(x^2-1\right)\left(x^2+1-2x\right)}{x^2-1}\)
= \(x^2+1-2x\)= \(\left(x-1\right)^2\)
b, (8x3-6x2-5x+3):((4x+3)
a) 6x3 + 3x2 + 4x + 2
= ( 6x3 + 3x2 ) + ( 4x + 2 )
= 3x2( 2x + 1 ) + 2( 2x + 1 )
= ( 2x + 1 )( 3x2 + 2 )
=> ( 6x3 + 3x2 + 4x + 2 ) : ( 3x2 + 2 ) = 2x + 1
b) 2x3 - 26x - 24
= 2( x3 - 13x - 12 )
= 2( x3 + 4x2 - 4x2 + 3x - 16x - 12 )
= 2[ ( x3 + 4x2 + 3x ) - ( 4x2 + 16x + 12 ) ]
= 2[ x( x2 + 4x + 3 ) - 4( x2 + 4x + 3 ) ]
= 2( x2 + 4x + 3 )( x - 4 )
=> ( 2x3 - 26x - 24 ) : ( x2 + 4x + 3 ) = 2( x - 4 ) = 2x - 8
c) x3 - 7x + 6
= x3 - 3x2 + 3x2 + 2x - 9x - 6
= ( x3 - 3x2 + 2x ) + ( 3x2 - 9x + 6 )
= x( x2 - 3x + 2 ) + 3( x2 - 3x + 2 )
= ( x2 - 3x + 2 )( x + 3 )
=> ( x3 - 7x + 6 ) : ( x + 3 ) = x2 - 3x + 2
a,\(\left(6x^3+3x^2+4x+2\right)\div\left(3x^2+2\right)\)
\(=\left[3x^2\left(2x+1\right)+2\left(2x+1\right)\right]\div\left(3x^2+2\right)\)
\(=\left[\left(3x^2+2\right)\left(2x+1\right)\right]\div\left(3x^2+2\right)\)
\(=2x+1\)
\(=\dfrac{3x^3-3x^2-21x-21+12}{3x-3}\)
\(=x^2-7+\dfrac{4}{x-1}\)