函数的零点是函数的重要性质之一,它把函数、方程、不等式紧密地联系在一起。函数的零点个数、零点范围以及与零点有关的参数的范围问题是高考中重点考查的几个方面。处理此类问题时,不但需掌握零点存在性定理,还要充分运用等价转化、函数与方程、数形结合等思想方法,才能迅速有效地找到解题的突破口。 The zero point of a function is one of the important properties of a function, which closely ties functions, equations and inequalities together. Zero function of the number of zero range and zero-related parameters of the scope of the problem is the entrance examination of several aspects of the test. In dealing with such problems, not only need to grasp the zero existence theorem, but also make full use of equivalence transformation, function and equation, combination of number and other thinking methods in order to quickly and effectively find a solution to the problem.