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Yahoo!奇摩知識+ - 分類問答 - 科學常識 - 已解決
Yahoo!奇摩知識+ - 分類問答 - 科學常識 - 已解決 
數列級數-觀察求通式並求和
Aug 25th 2013, 04:27

觀察下列數列a_1,a_2,a_3,a_4,a_5,a_6,.......如下:
1,10.1,101.01,1010.101,10101.0101,101010.10101,.......
此處一般項a_n用十進制表示時是n個1和(n-1)個0交錯排列,整數部分是n位數。
試求:
(1)用一般式表示a_n
(2)求此數列從首項到第n項的和為何?

煩請給予詳細計算過程,謝謝^0^~~~~

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