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近年来,在各地中考试题中涉及分类讨论的问题十分常见,因为这类试题不仅考查学生的数学基本知识与方法,而且考查了学生思维的深刻性.在解决此类问题时,许多学生因考虑不周全导致失分,究其原因,主要是平时的学习中,对分类讨论的数学思想理解不深、重视不够造成的.我们应当明确,当数学问题中的条件、结论不明确,或题意中含参数或图形不确定时,我们一般需要采取分类讨论的方法进行解决,即对问题中的各种情况进行分类,或对所
In recent years, it is very common to discuss classified discussions in the middle school exams throughout the country because such exams not only examine students’ basic knowledge of mathematics and methods, but also examine the profoundness of student thinking. In solving such problems, many students consider Not fully lead to lost points, the reason, mainly in the usual learning, understanding of the mathematical thinking of the classification is not deep, not enough attention .We should make clear that when the mathematical problems in the conditions, the conclusions are not clear, or the problem In the parameters or graphics are uncertain, we generally need to take the method of classification to solve the problem, that is, the problems in the classification,