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综观近几年的中考试题,对函数内容的考查占了比较大的比例.由于函数部分的概念、性质大都比较抽象,学生理解起来有较大的困难,因此学生在解题时经常出现各种似是而非的错误.本文结合教学中的具体实例,对学生在解函数问题中的常见错误进行一些剖析.一、忽视函数的实际意义例1用解析式将等腰三角形的顶角的度数y表示为底角的度数x的函数,并求自变量x的取值范围.错解由题意,得2x+y=180,
Looking at the examination questions in recent years, the examination of the function of the content accounted for a large proportion of the function part of the concept, the nature of most of the more abstract, students understand that there are greater difficulties, so students often have a variety of problems Plausible mistakes.This article combined with the teaching of specific examples of students in the solution to the problem of some common mistakes in some analysis.One ignore the practical significance of the function Example 1 with the isosceles triangle vertex angle y The angle of the base angle x function, and find the value of the range of independent variables x. The wrong solution by the title, 2x + y = 180,