Mathematics
Senior High
2段目の式から3段目の答えを出す計算方法を教えていただきたいです🙇♀️
よって
-2S=1+2(3+3°+3°+·
J3·(3%-1-1)
=1+2{
ー(2n-1)-3"
3-1
したがって
S=(n-1).3"+1
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aん
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