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高三复习阶段,如果我们能够精心地选择一道例题,并由此出发引导学生思考多种解法,并在原题基础上进行适当地变式,则可以有效拓展知识点,利于学生透过变式练习找到解决问题的通性通法,有效消除解题恐惧感,提高学习效率。下面,笔者就以一道经典的“陈题”为例进行说明。1试题展现题目:(2013年高考数学全国新课程卷Ⅱ理科第15题)设《为第二象限角,若tan(《+π/4)=1/2,则sin《+cosθ=____。分析:本题是一道小题,解题的切入点非常明显,学
Senior high school review stage, if we can carefully select a case, and thus starting to guide students to think about a variety of solutions, and based on the original title of the appropriate variants, you can effectively expand the knowledge point, which will help students through the variant exercises to find Solve the problem of common method, effectively eliminate the problem of fear, improve learning efficiency. Here, I will be a classic “Chen title ” as an example to illustrate. 1 questions show topic: (2013 college entrance examination mathematics new curriculum volume II science 15) set “for the second quadrant angle, if tan (” + π / 4) = 1/2, then sin "+ cosθ = ____. Analysis: This question is a small topic, the solution to the entry point is very obvious, learn