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选择题目前已经成为初中试题中必有的固定题型,它不仅考查学生对基础知识、基本技能的掌握情况,还渗透了各种数学思想方法和基本活动经验.由于初中数学选择题是单选的特点,因此决定了做选择题方法的独特性和技巧性,下面就以一些试题为例介绍几种做选择题的策略.一、筛选法筛选法就是采用简捷有效的手段对各个备选答案进行筛选,将其中与题干相矛盾的干扰支逐一排除,从而获得正确结论.图1例1二次函数y=ax2+bx+c(a≠0)的
The multiple-choice questions have become the fixed questions in the middle-school questions at present, which not only examines students’ mastery of basic knowledge and basic skills, but also permeates various mathematical thinking methods and experiences of basic activities.Because the middle school mathematics choice is a single choice So decided to do the uniqueness and skills of the multiple choice method, the following on some of the questions as an example to introduce several strategies to do multiple choice.First, the screening method is to use simple and effective screening method for each alternative answer We can get the correct conclusion by choosing the interferences which are contradictory to the subject.Example 1 The quadratic function y = ax2 + bx + c (a ≠ 0)