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学生在解题的过程中,会出现形形色色的错误。但在这些错误中,仔细归纳总结就能发现,大多数错误是学生欠缺相应的方法指导所致。以下就以最常说也最抽象的数形结合思想为例,从下面的例子中来看看如何把数学思想方法可操作化。一、特殊三角形之“求边求角代数化”例1:△ABC中,AB=AC,D为BC上一点,∠BAD=300,在AC上截取AE=AD,连结DE。求∠EDC的大小。分析:这个问题学生遇到了困难,原因是几何问题中的
Students in the process of solving problems, there will be all kinds of mistakes. However, a careful summary of these mistakes shows that most mistakes are due to students lacking the appropriate methodological guidance. The following is the most often said that the most abstract combination of figures and figures as an example, from the following example to see how to maneuver the mathematical approach. First, the special triangle “seeking edge algebra ” Example 1: △ ABC, AB = AC, D is BC on a point, BAD = 300, AC on the interception of AE = AD, link DE. Seeking the size of EDC. Analysis: Students on this issue have encountered difficulties due to geometric problems