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题库 / OG2017Q-DS-210
If x is a positive integer, what is the value of x ?
(1)x2 = ~$\sqrt{x}$~
(2)~$n \over x$~ =n and n≠ 0.
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
EACH statement ALONE is sufficient.
Statements (1) and (2) TOGETHER are NOT sufficient.
题目分析：
（1）~$x^2=\sqrt{x}$~ ，由于x是正数（x不为0），所以，两边平方得~$x^4=x$~，解得x=1。
（2）~$\frac{n}{x}=n$~ 并且n不为0，两边同时除以n得，~$\frac{1}{x}=1$~，解得x=1。
因此，本题答案为（D），任何一个条件说明均能解题。
x is a positive integer是题干给定条件，x不可能为0
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