Mathematics
Senior High
Solved
-s=の部分、なぜ-n・2^nが入るのですか
9=ニ1二2・2十32上…ーオ2
両辺に 2 を掛けると
25ニ 1・2キ2・22寺…土(ヵー1)・27ー二・27
辺々を引くと
=Sg1192二のキー27 ーカ2
- 宇 を 2"デテー(カー1)2"ー1
よって $テ(zz一 Nr
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