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![](https://rs.olm.vn/images/avt/0.png?1311)
b: \(=\dfrac{2x^4-2x^3-2x^2-3x^3+3x^2+3x+x^2-x-1}{x^2-x-1}\)
\(=2x^2-3x+1\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a: \(=\dfrac{2x^4-2x^3-2x^2-3x^3+3x^2+3x+x^2-x-1}{x^2-x-1}\)
\(=2x^2-3x+1\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Để \(A\left(x\right)⋮B\left(x\right)\Leftrightarrow a+1=0\)
\(\Leftrightarrow a=-1\)
Vậy ...
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(A\left(x\right)=2x^3-x^2-x+1\)
\(=\left(2x^3-4x^2\right)+\left(3x^2-6x\right)+\left(5x-10\right)+11\)
\(=\left(x-2\right).\left(2x^2+3x+5\right)+11\)
Vậy \(A\left(x\right):B\left(x\right)=2x^2+3x+5\) dư \(11\)
b) Để \(A\left(x\right)⋮B\left(x\right)\) thì \(11⋮B\left(x\right)\)
\(\Rightarrow x-2\inƯ\left(11\right)=\left\{\pm1;\pm11\right\}\)
\(\Rightarrow x\inơ\left\{13;3;2;-9\right\}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(x^2\left(y-1\right)-4\left(y-1\right)\\ =\left(y-1\right)\left(x^2-4\right)=\left(y-1\right)\left(x-2\right)\left(x+2\right)\)
b: \(\dfrac{A\left(x\right)}{B\left(x\right)}=\dfrac{x^4-\dfrac{1}{2}x^3+\dfrac{1}{2}x^3-\dfrac{1}{4}x^2+\dfrac{9}{4}x^2-\dfrac{9}{8}x-\dfrac{15}{8}x+\dfrac{15}{16}+a-\dfrac{1}{16}}{2x-1}\)
Để A(x) chia hết cho B(x) thì a-1/16=0
hay a=1/16