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先不考慮正負號原數列變為3,6,9,12,……,200420072010這是一個等差數列,首項為3,公差為3所以a100=3+99*3=100*3=300奇數項為正,偶數項為負,所以第一百個數為-300數列的和=(3-6)+(9-12)+……+(2001-2004)+(2…
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