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标题: GWD 11-34 [打印本页]

作者: dingzhiyin19 时间: 2006-4-14 07:33 标题: GWD 11-34

What is the value of the integer n?

(1) n(n + 2) = 15

(2) (n + 2)ⁿ = 125

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.

B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.

C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

D. EACH statement ALONE is sufficient.

E. Statements (1) and (2) TOGETHER are NOT sufficient.

请教思路答案应该是B 但如果比较正规推出B

谢谢

作者: casualwalk 时间: 2006-4-18 06:36

条件1）n＝－5 或者3

条件2） 125 为5的三次方没有别的整数可以找到了所以n只能等于3

作者: dingzhiyin19 时间: 2006-4-21 10:16

thanks a lot !!!!!!

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