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觀察這個數列得到分子是依次新增,而分母是2的n次方那不妨可以找到它的通項公式,也就是n/2的n次方Sn=寫幾項出來1/2Sn=寫幾項出來,注意這裡和上面Sn的式子挪一個位置讓Sn-1/2Sn這裡相减的時候,把分母相同的减去,而它們…
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