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1+2+2の平方+2の立方+2の3乗+2の4乗+2の99乗のこの式は2^0+2^1+2^2+2^2+2+2^99と書くことができますが、実は1つ目で、公比は2の等数列100項(0,1,99の合計100数)と、公q=1
いいえ、正一負も可能です。
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