高考试卷的压轴题都是导数应用相关的问题,其中求参的取值范围就是一类洛必达法则在导数试题中的应用重点考查的题型。这种题型很容易让考生想到用分离参数的方法,一部分试题用这类方法十分奏效,另一部分试题在高中范围内用分离参数的方法就不是很有效了,高中阶段解决它只有华山一条路-分类讨论和假设反证法的方法。 The finale of college entrance examination papers are derivative-related problems, the range of seeking parameters is a type of Law of Leprosy in the derivative test questions in the key exam questions. This type of question is very easy for candidates to think of using the method of separating parameters, part of the questions are very effective in this type of method, the other part of the test in high school with the method of separating parameters is not very effective, high school to solve it only Huashan a road - Methodology of categorical discussion and hypothetical disclaimer.