Mathematics
Senior High

この問題の解き方がわからないです、、教えてください🙏

2. 次の数列の和 S,をnの式で表せ。 1 1 1 1 2-5 5.8 8-11 (3月-1)3月+2) (2) S,=1-1+2-3+3-3*+…+n·3"-1 (2n-1)-3" +1 解(1) (2) S,= 23n+2) 4
等差数列 等比数列

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