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=1*2^0+1*2^1+1*2^3+…+1*2^2012 =1*(1-2^2013)/1-2 =結果は自分で計算する 式:Sn=a 1(1-q^n)/1-q a 1はじめの項qは公比である。
正の有理数、有理数、0
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