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⑴⑵を細かく解き方教えてください🙇‍♀️

208 次の条件によって定められる数列 (an} の一般項を, [ ] で示したおき換えを利用することにより求めよ。 *(1) ai=1, an+1=2an+n-1 [bn=an+1-an] (2) a=2, nan+1=(n+1)an+1 |6n=Cn| n

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数学高校生 5年以上前

198の⑴でマーカーで印をつけたところがなぜそうなるのか分かりません。教えてください🙇‍♀️

198 正の偶数の列を、次のような群に分ける。ただし、第n群には (2ォ-1) 個の数が入るものとする。 2|4,6,8| 10, 12, 14, 16, 18 | 20, LC 第1群第2群第3群 (1) 第n群の最初の数をn の式で表せ。 (2) 第10群に入るすべての数の和Sを求めよ。 198 (1) n>2のとき, 第1群から第(1n-1)群までに入る数の個数はよって + (2(1n-1)-1})= (n-1)? 求める数は,偶数の列の第{(n-1)?+1} 項であ a2= 1+3+5+ … a3 a4 るから a5 2(n-1)?+1}=2(n?-2n+2) これは n=1のときにも成り立つ。よって, 第n群の最初の数は 2) 第 10 群の最初の数は, (1) の結果を用いてよって 2(n?-2n+2) (3) a2= a3= a4- 2(10°-2-10+2) =164 よって, 和Sは, 初項 164, 公差2, 項数 2.10-1=19 の等差数列の和であるから a5= よっ S= (4) a2= -19(2.164+(19-1).2}=3458 2

解決済み回答数: 1

英語中学生 5年以上前

長文ですみません🙇‍♂️ 本文の和訳をお願いします🙏

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解決済み回答数: 2

英語中学生 5年以上前