[求助] 两道 PS 题

1.       if X is positive, which of the following could e the correct ordering of 1/x, 2x, and x²?

Ⅰx²﹤2x﹤1/x   Ⅱx²﹤1/x﹤2x  Ⅲ 2x﹤x²﹤1/x

我只举出了Ⅰ的例子，但是答案说Ⅱ也对，请教大家给我一个例子

2.       Last month 15 homes were sold in Town X. The average (arithmetic mean) sale price of the homes was
        ＄150,000 and the median sale price was ＄130,000. which of the following statements must be true?

Ⅰ
            At least one of the homes was sold for more than $ 165,000

Ⅱ
            At least one of the homes was sold for more than $130,000 and less than $150,000

Ⅲ
            At least one of the homes was sold for less than $130,000

答案选择Ⅰ。
        我不知道如何分析

知道的大牛们解释一下吧 谢谢

第一题

比如x=0.9

0.81<1.11<1.8