Problem Solving

试题详情

题目:

If x is positive, which of the following could be the correct ordering of 2x, and x2 ?

选项:

A、None
B、I only
C、III only
D、I and II only
E、I, II, and III

答案:

D

提问:

请问小梅老师,这类比较函数大小的问题有什么做法是能比较快速做出的吗?
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提问:

向May提问。我把x分情况讨论,当02时,1/x<2x
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