Mathematics
Senior High
写真のような問題で、規則性を見つけた後にそれをkで表すのが苦手なのですが、コツとかありますか?
次の数列の初項から第n項までの和をを用いて表せ。
S+
1 2
3
3
2
(2) 1, 3, 9, 27,
コ
そ3 t3
x3 x3
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