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| 2017/07/03 22:08:56瀏覽48｜回應0｜推薦0 | |
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此文章來自奇摩知識+如有不便請留言告知 等差&等比數列發問: 1.考慮一個序列f(n)=n^2 , n=0,1,2,3,...... 設T(n)=f(n)-f(n-1) 2.在6和54之間插入3個等差中項. 3.在6和3/16之間插入4個等比中項. 要步驟thanks =] 最佳解答: 1. find what? 2. 1st =6+(54-6)/4 = 18 2nd=6+2(54-6)/4 = 30 3rd=6+3(54-6)/4 = 42 3.1st =6+(3/16-6)/5 = 387/80 2nd=6+2(3/16-6)/5 = 147/40 3rd=6+3(3/16-6)/5 =201/80 4th=6+4(3/16-6)/5= 27/20 其他解答: |
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