Mathematics
Senior High
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答えが会いません。どこがまちがっているのか、教えて頂きたいです

和1-2+2-2°+3-2°+4-2*+…+n-2" を求めよ。
S=2+ 22*+g.25+ mtn.2m 225 = -S = 21+2# 4 25 +0+24 +h2のt 22項の 2(ー1) +n.20+ 2-1 =2(2-1) +h24+1 ミ 2h+-21n.2れt! こ - 2h41(n-2)X → (n-1)、2t1,2

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