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a) 3x^2-6x : -x+2
3x^2-6x : -3x
0
b) x^3 +2x^2 -2x -1 : x^2+3x+1
x^3 +3x^2 +x : x-1
-x^2 -3x -1 :
-x^2 -3x -1
0
a)=3xy2
b) x5+4x3-6x2 : 4x2
x5 : \(\overline{\frac{1}{4}x^3+x-1}\)
4x3-6x2 :
4x3 :
-6x2 :
-6x2 :
0
\(=\left[x^2\left(2x-5\right)+3\left(2x-5\right)\right]:\left(2x-5\right)\\ =x^2+3\)
a: \(=\dfrac{6x^2+9x+8x+12}{2x+3}=\dfrac{3x\left(2x+3\right)+4\left(2x+3\right)}{2x+3}\)
=3x+4
b: \(=\dfrac{5x^2-2x+15x-6}{5x-2}\)
\(=\dfrac{x\left(5x-2\right)+3\left(5x-2\right)}{5x-2}=x+3\)
c: \(=\dfrac{-8x^2+20x+2x-5-10}{2x-5}=-4x+1+\dfrac{-10}{2x-5}\)
d: \(=\dfrac{14x^2-35x+2x-5}{2x-5}=\dfrac{7x\left(2x-5\right)+\left(2x-5\right)}{2x-5}\)
=7x+1
e: \(=\dfrac{2x^3+x^2+6x^2+3x+12x+6}{2x+1}\)
\(=\dfrac{x^2\left(2x+1\right)+3x\left(2x+1\right)+6\left(2x+1\right)}{2x+1}=x^2+3x+6\)
f: \(=\dfrac{x^3-2x^2+6x^2-12x+x-2}{x-2}=x^2+6x+1\)
g: \(=\dfrac{12x^3+6x^2-4x^2-2x+6x+3}{2x+1}=6x^2-2x+3\)
a) Ta có: \(\frac{x^3-3x^2+x-3}{x-3}\)
\(=\frac{x^2\left(x-3\right)+\left(x-3\right)}{\left(x-3\right)}=\frac{\left(x-3\right)\left(x^2+1\right)}{x-3}=x^2+1\)
b) Ta có: \(\frac{x^2+2x+x^2-4}{x+2}\)
\(=\frac{x\left(x+2\right)+\left(x+2\right)\left(x-2\right)}{x+2}=\frac{\left(x+2\right)\left(x+x-2\right)}{x+2}=2x-2\)
c) Ta có: \(\frac{2x^3-5x^2+6x-15}{2x-5}\)
\(=\frac{x^2\left(2x-5\right)+3\left(2x-5\right)}{2x-5}=\frac{\left(2x-5\right)\left(x^2+3\right)}{2x-5}=x^2+3\)
Ta có:
\(2x^3-5x^2+6x-15\)
\(=\left(2x^3-5x^2\right)+\left(6x-15\right)\)
\(=x^2\left(2x-5\right)+3\left(2x-5\right)\)
\(=\left(x^2+3\right)\left(2x-5\right)\)
\(\Rightarrow\left(2x^3-5x^2+6x-15\right):\left(2x-5\right)=x^2+3\)
= x + 3 nha