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數型問題 深.........................................
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數型問題．幾深 求2,6,18,54,162 and 3,12,27,48,75...ge數型 更新: 幫幫我!!!
最佳解答:
1. 2, 6, 18, 54, 162, ... Obviously, this is a geometric sequence (等級數列) common ratio(公比), r = 6/2 = 3 First term(首項), a = 2 So, the general term is ar^(n - 1) = 2 X 3^(n-1) 2. 3, 12, 27, 48, 75 First term = 3 = 3 X 1^2 Second term = 12 = 3 X 2^2 Third term = 27 = 3 X 3^2 Fourth term = 48 = 3 X 4^2 Fifth term = 75 = 3 X 5^2 So, the general term is 3n^2
其他解答:
第一條 2 x (3)^n n=0,1,2,3........ 第二條 3 x n^2 n=0,1,2,3......
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