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案例描述案例A:①复习长方形、正方形面积计算和平行四边形的底与高。②教师引导学生数出方格图中的长方形和平行四边形面积,再观察它们之间的关系。
Case Description Case A: ① review rectangular, square area calculation and the parallelogram of the bottom and high. ② teachers guide students to count the number of rectangular grid and parallelogram area, and then observe the relationship between them.