论文部分内容阅读
解答应用题的关键,是正确分析数量关系,了解和掌握常用的解题思路。解题思路概括起来可分为两类:一般的解题思路和特殊的解题思路。而“改变已知条件法”是特殊解题思路中学生较难掌握的一种。“改变已知条件法”的思考方法是:适当改变应用题里的已知条件;使数量关系更为明显,所归结的问题更基础更简单;或者把繁杂的问题分解成几个连续性的问题,这就为定向分析提供了前提,从而使问题化难为易。那么,如何改变已知条件,怎样改变才适当呢?下面我们通过三个例题的具体剖析,来说明这两个问题。
The key to answering application questions is to correctly analyze the relationship between quantity, understand and master common problem solving ideas. To sum up the problem solving ideas can be divided into two categories: general problem-solving ideas and special problem-solving ideas. The “change of known conditions Law” is a special problem-solving ideas difficult to master a middle school students. The thinking method of “changing the known condition law” is to change the known conditions in the application question appropriately, to make the quantity relationship more obvious, to settle down the problem based on the simpler basis, or to decompose the complicated problem into several continuous Problem, which provides the prerequisite for directed analysis, so that the problem is difficult for the easy. So, how to change the known conditions, how to change it appropriate? Here we pass three specific examples of analysis, to illustrate these two issues.