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判别含参方程在定义域或指定区间根的个数以及反问题(即已知含参方程在定义域或指定区间存在根,要求确定参数的取值范围),这类问题是高考中的重要考点.在处理这类问题时,无论遇到何种类型的函数,都可以归纳为统一处理问题的方法.我们知道零点存在性定理是证明连续函数在闭区间上存在零点的基本方法,那么证明函数在区间上存在多个零点
Judging the number of roots of parameter-containing equations in the domain or the specified interval as well as the inverse problem (that is, the known parameter-containing equation exists in the domain or the specified interval, which requires determining the range of parameters). Such problems are important in the college entrance examination Test point in dealing with such issues, no matter what type of function encountered, can be summarized as a unified approach to the problem.We know that the zero existence theorem is to prove that the continuous function of the zero point in the closed interval of the basic method, then prove Function in the interval there are multiple zero