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1直接求一阶导数对于一阶导数形式简单的函数,直接求一阶导数后,通过对参数的简单讨论,便能由相应的不等式解出原函数的单调区间,从而利用函数的单调性得到参数的取值范围.例1(2011年北京卷,理18)已知函数f(x)=(x-
A direct first derivative For the first derivative of a simple function, seeking the first derivative directly, through a simple discussion of the parameters, the original inequality can be solved by the corresponding monotone interval, so that the use of monotonic function The range of parameters. Example 1 (2011 Beijing volume, Li 18) known function f (x) = (x-