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中学“排列与组合”这部分内容,一直是学与教的难点,无论教师还是学生,对所遇到的计数问题,大都对自己算出的结果不太自信.造成这一局面的原因是多方面的.笔者认为:影响学生解题成败的因素主要是以下几个方面:1对分类计数原理和分步计数原理的理解水平学生对分类计数原理普遍认为比较容易理解,个别题目难度来自于学生的分类方法是否恰当.大多数学生对分步计数原理的运用不够熟练.通过与
Middle school “arrangement and combination ” This part of the content, has always been the difficulty of learning and teaching, both teachers and students, most of the problems encountered in the calculation of their own results less confident .This is the reason Many.I think: the factors affecting the success or failure of the students problem is mainly the following aspects: A classification of counting principle and the principle of step-by-step understanding of the principle of classification and counting students generally think it easier to understand, the difficulty of individual topics from The classification of students is appropriate.Most students are not proficient in the use of the principle of step counting.Through