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選擇題：

1. 已答
http://tw.knowledge.yahoo.com/question/question?qid=1613080100326

填充題：

1. 75/15+8=13

2. 已答
http://tw.knowledge.yahoo.com/question/question?qid=1613080100209

3. 
(1)
相隔數位把數字加起來：
7+9+4+8=28
6+□+3=9+□
28-9-□需為11的倍數
19-□需為11的倍數
□=8

(2)
5n+3包括３，８，１３，１８，．．．，９３，９８共２０個

4.
(1)
最小的質數＝２
最小的合數＝４
和＝６

(2)
（Ｃ）９７是質數，不是矩形數。

5.
(1)
6*65*98*13 = (2*3)*(5*13)*(2*7*7)*13 = 2^2*3*5*7^2*13^2

(2)
37485 = a^2*5*7^b*c
37485 = 5*7497 = 5*7*1071 = 5*7*7*153 = 5*7*7*3*51 = 5*7*7*3*3*17
所以，a=3, b=2, c=17。
a+b+c=22。

參考資料 Calculated

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