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由于开放性试题能突出对考生能力的考查,因此它连续成为近几年全国各省市中考卷中的热点题.一、存在开放性问题这类问题是在一定的条件下,判断一些数学结论是否存在,其关键语言是“是否存在……,使……(成立)”.其解法是先对结论予以肯定(假设结论成立),再进行推理论证.如果推出矛盾的结果,则先前肯定的结果不成立;如果推出结果合理,或与已知的事实相符,则以前的假设正确.
Because the open questions can highlight the examinee’s ability, it has become a hot topic in the examination papers of all provinces and cities in China in recent years. First, there are open questions. These questions are under certain conditions, to determine whether some mathematical conclusions Existence, the key language is “the existence of ..., so that ... (established) ”. The solution is to first affirm the conclusion (assuming the conclusion is true), and then to verify the theory. If the contradictory results are introduced, the previous affirmation The results are not valid; if the results are reasonable or consistent with known facts, the previous assumptions are correct.