函数是数学学习的重点和难点。课堂教学中就易混淆的函数问题须进行实例讲解。一、函数的图象和方程的图象问题例:下列可作为函数y=(fx)的图象的是(D)分析讲解:此题考查函数的概念,在给定的对应关系下,自变量x在其定义域的每一个值,都有唯一确定的函数值y。若对函数概念理解不清,易和方程的图象弄混,错选为A,甚至可能束手无策。二、函数的周期性和对称性问题 Function is the focus and difficulty of mathematics learning. Classroom confusion in the function of the problem to be an example to explain. First, the image of the function and the image of the equation Problem Example: The following can be used as a function of the image y = (fx) is (D) Analysis: This question examines the concept of the function, given a correspondence between The variable x has a uniquely defined function value y for each value in its domain. If you do not understand the concept of function, easy and equation image confusion, the wrong choice for A, may even helpless. Second, the function of the periodic and symmetrical problems