Mathematics
Senior High
なぜ1枚目の式では等比数列の和の公式を使うのに、2枚目だと別の公式を使うんですか？
4 [クリアー数学B 問54]
次の和を求めよ。
(1) 7-y
い
7-1
6
35
(3) Σ k²
135(35+1)(
149:0
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