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排列组合应用题变化多,解题无一定方法可循.对于一道条件排列组合应用题,学生对自己作出的答案往往半信半疑,因为他们在埋头作题的过程中,尝到了“要么重复、要么遗漏”的苦头.如何帮助学生突破这一难点,在“理论指导”这一教学原则的启发下,我利用“整体部分观”这个观点,认识基本原理与基本公式,也用它来指导求解应用题的思维方法.使学生在解应用题时运用自如.
There are many changes in the composition and application problems, and there is no certain way to solve the problem. For a conditional combination and application problem, students often doubt their answers to their own answers because they have tasted “repeated or missing” in the process of burying the subject. How to help students break through this difficult point, inspired by the teaching principle of “theory guidance”, I use the concept of “partial part view” to understand the basic principles and basic formulas, and use it to guide solving problems. The way of thinking. Enables students to use freely when solving problems.