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选择题和填空题是一类只注重结果而不需对一般情形进行推证的特殊问题.根据这一特点,将问题的一般情形转化为特殊情形,用特例来探求解题的途径,可避免繁琐的计算和推证,从而简便而快捷地求出问题的答案.下面举例说明构造特例的常用方法.
Multiple-choice questions and fill-in questions are a special problem that emphasizes results only and does not need to evoke general situations. According to this feature, the general situation of the problem is transformed into a special case, and the use of special cases to explore the solution to the problem can be avoided. The tedious calculations and inferences make it easy and quick to find the answers to the questions. The following examples illustrate common methods for constructing special cases.