GWD-29-3 求助一道DS题！！！

elaine0

Q3:
If n is an integer and x^n – x^(-n )= 0, what is the value of x ?
(1)          x is an integer.
(2)          n ≠ 0        
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.
答案是e 我认为是b 求助nn！！

宝宝的瓜

例如1，2条件同时满足时， N=1时，X取 -1 和+1皆可
好久不写数学了，错了轻拍

elaine0

宝宝的瓜 发表于 2014-4-18 20:54
例如1，2条件同时满足时， N=1时，X取 -1 和+1皆可
好久不写数学了，错了轻拍 ...

酱紫啊。。是我没考虑到。谢谢~