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1+2+2的平方+2的立方+2的3次方+2的4次方+…+2的99次方這個式子可以寫作2^0+2^1+2^2+…+2^99可以發現它實際上是一個第一項為1,公比為2的等比數列100項(0,1,…99共100個數)的和若公比q=1,S[n]=na [1]若公比q≠1…
不對,一正一負也是可能的
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