抽象函数是指未给出函数解析式,只是指明符合函数定义或者给出部分性质,一般以y=f(x)形式给出,不用数字和字母表示出来的函数。由于没有解析式,函数的对应法则不具体,让学生感觉抽象、无从下手、难度大,不易处理。抽象函数问题既是教学中的难点,又是近几年来高考的热点。纵观近三年高考,很多省市的高考都会对这一问题进行考察,进 Abstract function refers to the function is not given function analytic, but only to indicate the definition of the function or given some properties, usually given in the form of y = f (x), not the number and letters of the function. Because there is no analytic formula, the corresponding function of the law is not specific, so that students feel abstract, no start, difficult, not easy to handle. The problem of abstract function is not only the difficulty in teaching, but also the hot spot of college entrance examination in recent years. Throughout the past three years college entrance examination, many provinces and cities entrance examinations will examine this issue, into