函数有两种主要表示方法:解析法和图像法.解析法是通过“数(式)”的形式准确地表示出函数的自变量和应变量之间的等量关系,而图像法是从“形”的角度直观形象地刻画了函数的变化规律.这两种表示方法是同一个函数的两种不同表现形式,这也就决定了我们对函数的研究要多从这两个角度入手,让这两者相辅相成.而不等式和方程其实就是在不等号和等号的两侧放置不同的函数,一般出题的形式是以研究这两个函数表达式之间的关系为主,解决这类问题需要由数(式)引形,以形助数 There are two main representations of functions: analytical methods and image methods. Analytic methods accurately represent the equal relationship between the arguments and the corresponding variables of a function through the form of “number”, and the image method is From the perspective of “shape”, we intuitively and vividly portrayed the law of change of the function. These two kinds of expressions are two different forms of the same function, which also determines that we must study the function from these two Starting from the angle, let the two complement each other. Inequality and equations are actually placing different functions on both sides of the equal sign and the equal sign. The general question is in the form of studying the relationship between these two function expressions. This type of problem needs to be shaped by numbers (formulas) to help