2020-II-05

12-06-2023 app.cch 尚無留言

答案：B

\begin{array}{cl} f (1 + β) - f (1 - β) \\ = & [3 (1 + β)^{2} - (1 + β) - 2] - [3 (1 - β)^{2} - (1 - β) - 2] \\ = & (3 + 6 β + 3 β^{2} - 1 - β - 2) - (3 - 6 β + 3 β^{2} - 1 + β - 2) \\ = & 10 β \end{array}