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一、建模点梳理模型1:平行四边形面积计算推导方法。模型2:三角形面积计算推导方法。模型3:梯形面积计算推导方法。模型4:平行四边形面积计算模型。模型5:三角形面积计算模型。模型6:梯形面积计算模型。模型7:图形拼割转化方法。二、模型分析模型1:平行四边形面积计算推导方法。这是学生第一次进行面积计算的推导,通过图形的切割、变换,把平行四边形的面积与长方形面积建立联系,从而推导出平行四边形面积的计算公式。理解的重点是四个“相等”:一
First, the modeling point combing model 1: parallelogram area calculation and derivation method. Model 2: Derivation of triangle area calculation method. Model 3: Trapezoidal area calculation and derivation method. Model 4: Parallelogram area calculation model. Model 5: Triangular Area Calculation Model. Model 6: Trapezoidal Area Calculation Model. Model 7: Graphic segmentation transformation method. Second, model analysis Model 1: parallelogram area calculation and derivation method. This is the first time for students to derive the area calculation. Through the cutting and transformation of the graph, the area of the parallelogram is connected with the area of the rectangle, and the formula of the area of the parallelogram is deduced. The point of understanding is four “Equal ”: one