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問一題數學題

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問一題數學題

文章mega » 2007-03-22 17:34

A positive integer with exactly two different divisors greater than 1 must be
(A)a prime
(B)an even integer
(C)a multiple of 3
(D)the square of a prime
(E)the square of an odd integer
from:錢永強GRE難題, section3 第19題
mega
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文章: 19
註冊時間: 2006-06-02 08:18

文章zeppelin » 2007-03-29 09:37

題目翻譯完應該就沒問題了:

一個正整數正好有兩個"不同於1"且"比1大"的因數必是:

答案是 D
zeppelin
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註冊時間: 2006-05-08 13:28

文章mega » 2007-04-02 05:31

= =經過你的翻譯,我一直想當初是怎麼看不懂得ㄏㄏ
我想再問一題
The "reflection" of a positive integer is obtained by reversing its digits. For example, 321 is the reflection of 123.
The difference between a five-digit integer and its reflection must be divisible by which of the following?
(A)2 (B)4 (C)5 (D)6 (E)9
Ans:E
from:PP2
感謝喔
mega
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文章機車小邱 » 2007-04-03 21:08

mega \$m[1]:
The "reflection" of a positive integer is obtained by reversing its digits. For example, 321 is the reflection of 123.
The difference between a five-digit integer and its reflection must be divisible by which of the following?
(A)2 (B)4 (C)5 (D)6 (E)9
Ans:E
from:PP2
感謝喔


five-digit integer = a + 10b + 100c + 1000d + 10000e
its reflection = 10000a + 1000b + 100c + 10d + e
difference = - 9999a - 990b + 990d +9999e
頭像
機車小邱
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文章: 13
註冊時間: 2004-07-30 13:09
來自: 士林


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