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选择题是中考数学试题中的固定题型,是指从一组选项当中,选出一个或多个作为正确的答案。选择题作为一种标准化试题,在中考中占有相当大的比重,分值大约占总分的25%~40%。下面给同学们介绍选择题的一些常见解法,希望对大家有所帮助。一、直接法直接法是解答选择题的一种最基本的方法。它是从选择题的题设条件入手,根据学过的定义、公式、公理、定理、法则等进行正确推理,求出结果得出结论,然后与各选择项比较,从而得到正确的答案。例1如图1,从圆外一点P引圆O的两条切
Multiple choice questions are fixed questions in the senior high school entrance examination questions, which means that one or more of the options are selected from the list as the correct answer. Multiple choice questions as a standardized test questions, in the examination occupies a large proportion of the total score of about 25% to 40%. Here are some common solutions to the students on the multiple choice, I hope to be helpful to everyone. First, the direct method Direct method is to answer multiple-choice questions one of the most basic method. It is from the multiple choice questions to start with the conditions, according to the learned definition, formula, axioms, theorems, rules and so on correct reasoning, find the results to draw conclusions, and then compared with the various options to get the correct answer. Example 1 As shown in Figure 1, from the outside of the circle point P circle O two cut