Mathematics
Senior High

なんでこの赤い計算になったのか理由がわかりません

(0 3 g語= 9モリ…⑨ (ヵ =1, 2, 3, …) ⑧は階差数列型の河化式より, 階差数列型 り, これは初項 @=ニ3,公比7=3の3 ( me デ 3 3 ーェ-3

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