d********d
发帖数: 109 | 1 求高人指教如何计算附件里的积分，其中 ai and bi 是常量。期待回复。先谢谢了 | d********d
发帖数: 109 | 2 怎么没人理呀，等待中
【在 d********d 的大作中提到】
: 求高人指教如何计算附件里的积分，其中 ai and bi 是常量。期待回复。先谢谢了
| j******n
发帖数: 271 | 3 Just my 2 cents - I didn't work it through though:
Rewrite the integral as c x \int_{-\inf}^{+\inf} e^{-a t^2}/(1-b e^{-t}) dt,
where a, b, c are some consts. Expand 1/(1-b e^{-t}) as
\sum b^n e^{-nt}. Each term is then integrated in finite and closed form. If
you major in math, you also need to worry about convergence. |
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