Mathematics
Senior High
Resolved
階差数列です
221番（４）です。
1・(3n-1 -１)/3-1ときて
最後なぜ1・(3n-1 +1)/2 と
-1が+1になるのか分かりません。
教えて下さい!!
の=る2 *ー3z*上みみ十6)
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