Mathematics
Senior High
分数列の問題です。部分数列に分けて、途中を消すと解説には書かれているのですが、よく分かりません。🥲
解いてくださる方いらっしゃいませんか？できれば解説もお願いしたいです🙇♀️
PRACTICE (基本) 21 次の数列の初項から第n項までの和を求めよ。
2
2
2
1.3' 3.5' 5.7'
(1)
......
148.
(2)
1
1-5
1.5' 5.9
1
9.13'
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