Mathematics
Senior High
どっちもわからないです
途中式とか書いてもらえたら嬉しいです😂
7 次の数列の初項から第n項までの和を求めよ.
(1) 1-2, 4-6, 7.10, 10-14,
(2) 3-1, 32-1, 33 -1, 34-1,
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