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六年制小学数学第六册“长方形、正方形面积的计算”，是在学生初步理解面积的意义，了解面积单位的基础上进行教学的，是进一步学习其它平面图形面积计算的基础。教学中应引导学生有层次地操作、观察，从中发现长方形的长和宽与面积的关系，归纳出它的计算公式。然后通过应用?
The sixth volume of six-year primary school mathematics, “Calculation of Area of Squares and Squares”, is based on the students' initial understanding of the significance of the area and the understanding of the basis of area units. It is the basis for further studying the area calculation of other plan areas. Teaching should guide students to operate at different levels, observe, find the relationship between the length and width of the rectangle and the area, summed up its formula. Then through the application?