Mathematics
Senior High
1枚目の問題のやり方がわかりません。答えは2枚目です
教えてください！
5n≧2 のとき, 和 S = 1・1+3・2 +5.2°+
......
+(n-1)・2″-1 を求めよ。
5
S=(2n-3).2" +3
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