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數學戲法

數學戲法. 你能找出原因嗎 ?. why?. 1. 寫下一個三位數 , 使得百位數字比 個位數字大 2 以上 . 把數字倒過來 , 相減 . 再把數字倒寫後 , 兩數相加 . 結果都是  1089 例子 : 872 - 278 594 + 495 1089. 1089 的倍數. 說明. Fibonacci 數列 1,1,2,3,5,8,13,21,34,55,89……….. ( 第二項以後 , 每一項均為前兩項的和 ) 教學生到黑板旁 , 隨便寫兩個數字 , 如 4,9

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數學戲法

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  1. 數學戲法 你能找出原因嗎?

  2. why? 1.寫下一個三位數,使得百位數字比 個位數字大2以上. 把數字倒過來,相減. 再把數字倒寫後,兩數相加. 結果都是1089 例子: 872 - 278 594 + 495 1089 1089的倍數 說明

  3. Fibonacci數列 1,1,2,3,5,8,13,21,34,55,89……….. (第二項以後,每一項均為前兩項的和) 教學生到黑板旁,隨便寫兩個數字,如4,9 仿Fibonacci數列寫法 1……… 4 6……… 57 2……… 9 7……… 92 3………13 8………149 4………22 9………241 5………35 10………390 此數列前十項之和為多少? A: 1012(=92×11)

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