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第16章 速解技巧（第2页）

的形象，俞启瑞却是那种看起来非常努力，笔记本记得密密麻麻，但成绩却不怎么见起色的类型。

“怎么？”

洛北问，看见俞启瑞把一个本子塞到他的面前。

又是问题。

“北哥，帮看看这第12题选择。”

俞启瑞全然不顾当初他跟洛北一点不熟，嬉皮笑脸地说。

甚至都没有问他有没有空。

洛北皱了皱眉，瞥了眼题目。

这是一道不等式：

若aamp;amp;gt;bamp;amp;gt;1，p=√（lga·lgb），q=（lga+lgb）2，r=lg（a+b）2，则

a.qamp;amp;gt;pamp;amp;gt;r

b.ramp;amp;gt;qamp;amp;gt;p

c.ramp;amp;gt;pamp;amp;gt;q

d.qamp;amp;gt;ramp;amp;gt;p

常规解法的话，需要利用均值不等式，对p、q、r依次比较大小。

不是什么难题，但得动笔算算。

不过，洛北一眼看出，这道题正好可以通过特殊值法速解，两秒就能心算出来。

如此甚好，他可懒得在这个不知所谓的傢伙身上浪费时间。

“选b。”

几乎是瞬间，洛北给出了答案。

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