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选择题在中考试卷中所占比例较大,具有题小、量大、基础、快速、灵活的特征.解答选择题遵循的基本原则是小题小做,小题巧做.为了又快又准确地找到解题的答案,我们以2014年中考题为例,共同探讨选择题的结构及解答方法和技巧.1.假设法当某一变因素的存在形式限定在有限种可能(如某命题成立或不成立,如a与b大小:有大于小于或等于三种情况)时,假设该因素处于某种情况(如命题成立,如a>b),并以此为条件进行推理,谓之假设法。它是科学探究中的重要思想方法,大量应用于数学、物理研究中,是一种创造性的思维活动。例1(2014·广西玉林市、防城港市)x1,x2是关
The multiple-choice questions have a large proportion in the examination papers, and they have the characteristics of small, large, basic, fast, and flexible. The basic principle of answering multiple-choice questions is to make small and small questions and to make small questions. To be fast and accurate To find the answer to the problem, we took the 2014 mid-term exam as an example to discuss the structure of the multiple-choice questions and their solutions and techniques. 1. Assume that the law exists when the existence of a variable is limited to a limited number of possibilities (such as the establishment of a proposition Or does not hold, such as a and b size: when there is more than or less than or equal to three cases), assuming that the factor is in a certain situation (such as the proposition is established, such as a>b), and use this as a condition for reasoning, that the hypothesis . It is an important way of thinking in scientific inquiry. It is used in a large number of studies in mathematics and physics and is a creative thinking activity. Example 1 (2014, Yulin City, Fangchenggang City, Guangxi) x1, x2 is