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标题: gwd-5-13 [打印本页]

作者: goodfishs    时间: 2006-2-6 10:47     标题: gwd-5-13

Q13:

What is the value of the integer n?

(1) n(n + 2) = 15

(2) (n + 2)n = 125

The right answer is B but why not D?

From (1) we can get 1,3,5,15 are the facters of 15. But only when n=3, n(n+2)=15 is valid.

From (2) we can get 125 = 5^3, so n=3, (n+2)^n is valid.


作者: ghfgss231    时间: 2006-2-6 12:33

选项(1)中,n还可以等于-5,也可以等于3,所以两个解,不能确定.
作者: leadership    时间: 2006-2-7 17:10

假设

Q13:

What is the value of the integer n? (没有提到是整数)

(1) n(n + 2) = 15

(2) (n + 2)n = 125

那么结果还是B吗,除了3,还有别的数(不论整数分数)能够满足

(n + 2)n = 125 吗,

我认为没有了,不知大家有没有别的想法

欢迎讨论


作者: goodfishs    时间: 2006-2-12 07:40

thanks @!!!!!!!!!!!




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