Gaokao Math Practice Question
$\left(x+\frac{a}{x}\right)\left(2 x-\frac{1}{x}\right)^{5}$ 的展开式中各项系数的和为 2 , 则该展开式中常数项为 ($\qquad$)
- A.-40
- B.-20
- C.20
- D.40
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