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tmjhmath
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九九乘法表之秘密
AI-enhanced description
本文探讨了九九乘法表的数学特性,并提出了一些相关的数学问题,例如表格中的数字总和、立方和和平方和的问题。通过不同的思考方式和数学证明,展示了这些数学概念的内在联系。最后强调了发现与证明的乐趣。
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九九乘法表之秘密
1.
九九乘法表的秘密 81 72
63 54 45 36 27 18 9 9 72 64 56 48 40 32 24 16 8 8 63 56 49 42 35 28 21 14 7 7 54 48 42 36 30 24 18 12 6 6 45 40 35 30 25 20 15 10 5 5 36 32 28 24 20 16 12 8 4 4 27 24 21 18 15 12 9 6 3 3 18 16 14 12 10 8 6 4 2 2 9 8 7 6 5 4 3 2 1 1 9 8 7 6 5 4 3 2 1 乘
2.
表格內你看到什麼 ? 問題一
: 表格內數字的總和 ? 問題二 : 試求 1 3 +2 3 +3 3 +4 3 +…+9 3 =? 問題三 : 表格內對角線上數字之和 (1 2 +2 2 +3 2 +4 2 +...+9 2 )=?
3.
問題一 : 表格內數字的總和
? 1 ×(1+2+3…+9)+2 ×(1+2+3…+9)+ 3 ×(1+2+3…+9)+…9 ×(1+2+3…+9) = (1+2+3…+9) ×(1+2+3…+9) = (1+2+3…+9) 2 =45 2 =2025 不比 高斯 差
4.
另類思考 : 你看到什麼
? ( 將數字用球數代替 ) 你的心得是 ? 問題二 : 試求 1 3 +2 3 +3 3 +4 3 +…+9 3 =? 1 4 2 2 9 6 3 3 6 9 9 81 27 18 27 18 … … …
5.
結論 :
6.
PROOF WITHOWT WORDS
( 無言的證明 ) 1+2+3+4+5
7.
問題三 :1 2
+2 2 +3 2 +4 2 +...+9 2 =? (1+2+3+4)×(4+1)=1 2 +2 2 +3 2 +4 2 + 1+(1+2)+(1+2+3)+(1+2+3+4) 高中教∑時 , 就 ok 了 人生最高興的事 : 發現又證明之
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