函数图象形象地显示了函数的性质,为研究数量关系问题提供了“形”的直观性,它是探求解题途径、获得问题结果的重要工具。从常见函数的图象入手,巧妙地运用图象与不等式或方程之间的关系,将方程f(x)=g(x)的解的个数可以转化为函数y=f(x)与y=g(x)的图象的交点的个数,不等式f(x)>g(x)的解集转化为f(x)图象位于g(x)图象上方的那部分点的横坐标的取值范围或涉及以上两类参数、比较大小和有关零点的问题,数形结合是解决此 The function image shows the nature of the function graphically. It provides an intuitive “” shape for the study of quantitative relations. It is an important tool to explore the way to solve the problem and obtain the result of the problem. Starting from the image of a common function, the number of solutions of the equation f (x) = g (x) can be transformed into the function y = f (x) and y = x (x), the solution set of the inequality f (x)> g (x) is transformed into the abscissa of the point at which the f (x) image is located above the g (x) The scope of the value or involving the above two types of parameters, the size and the problem of zero, the combination of number is to solve this