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学习数学,要善于总结反思,归类题型,提炼解题策略与方法.本文以义务教育教科书苏科版八年级《数学》上册“一次函数”为例,谈谈所涉及的一些考点及其攻略.考点一:概念的应用例1下列函数中,x是自变量,y是因变量,哪些是一次函数?哪些是正比例函数?(1)y=3x;(2)y=3/x;(3)y=-3x+1;(4)y=3x~2.[解析]本题考查了一次函数的概念,解题关键是要明确一次函数的条件:①函数的解析式是整式,②自变量的最高次数是1,③自变
To learn mathematics, we should be good at summarizing the reflection, classifying the types of questions, and refining the strategies and methods of solving the problems.This paper takes the eighth grade “Mathematics” of the compulsory education textbook “first order function” as an example to talk about some of the test sites involved (1) y = 3x; (2) y = 3 / y, and y = 3 / y, where x is the dependent variable, y is the dependent variable, (3) y = -3x + 1; (4) y = 3x ~ 2. [Analysis] This question examines the concept of a function, the key to solving the problem is to clarify the conditions of a function: The function of the analytic formula , ② the highest number of independent variables is 1, ③ self-change