#1
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͹ءÃÁ (µèÍ)
1. ãËé \sum_{n = 1}^{\infty} ¢Í§ a à»ç¹Í¹Ø¡ÃÁÅÙèà¢éÒÍÂèÒ§ÊÁºÙóìáÅÐ \sum_{n = 1}^{\infty} ¢Í§ b Áբͺࢵ ¨Ðä´é \sum_{n = 1}^{\infty} (a\times b) ÅÙèà¢éÒ ¨§¾ÔÊÙ¨¹ì (¢éÍÊͺ ».â· ¨ØÌÒ 2552)
ú¡Ç¹¼ÙéÃÙéªèǾÔÊÙ¨¹ìãËé˹èͤÃѺ ¢Íº¤Ø³ÁÒ¡¤ÃѺ |
#2
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ËÁÒ¶֧Ẻ¹ÕéÃÖà»ÅèÒ
$\sum_{n=1}^{\infty}a_n$ ÅÙèà¢éÒÍÂèÒ§ÊÑÁºÙóì áÅÐ $\{b_n\}$ Áբͺࢵ áÅéÇ $\sum_{n=1}^{\infty}a_nb_n$ ÅÙèà¢éÒÍÂèÒ§ÊÑÁºÙÃ³ì ¶éÒẺ¹Õéãªé comparison test ·Õà´ÕÂǨº¤ÃѺ ÊÁÁµÔ $|b_n|\leq M$ $|a_nb_n|\leq M|a_n|$
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site:mathcenter.net ¤Ó¤é¹ |
#3
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