Ta có: \(x^2-\dfrac{3}{2}x-1\)
\(=x^2-2x+\dfrac{1}{2}x-1\)
\(=x\left(x-2\right)+\dfrac{1}{2}\left(x-2\right)\)
\(=\left(x-2\right)\left(x+\dfrac{1}{2}\right)\)
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