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含参问题是训练和检查学生逻辑理解能力和分析能力的一种综合题型,运用导数确定含参数函数的参数取值范围是一类常见的探索性问题.以函数为载体,以导数为工具,考查函数性质及导数应用为目标,是最近几年函数与导数交汇试题的显著特点和命题趋向.一、运用导数求含参问题的单调性与最值求单调性与最值时首先写出函数定义域,然后求导.一般情况下求导后考虑导函数为零是否有实根(或导函数的分子能
The problem of ginseng parameter is a comprehensive type of training and checking students’ logic comprehension ability and analytical ability. It is a common exploratory problem to determine the parameter range of parameter-containing function by using derivatives. Taking function as carrier and derivative as tool , Examining the nature of the function and the application of the derivative as the goal is the salient features and proposition tendencies of the intersection of the function and the derivative in recent years.First, use the derivative to find the monotonicity and the most monotonicity and the most value Function definition domain, and then derive.In general, after derivation, consider whether the derivative function has a real root (or the numerator of the derivative function