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五年级的学生在学习过平面图形面积的计算后,已清楚各种平面图形的面积公式及推导过程,基于此,组合图形面积的计算的重点是让学生综合应用学过的面积公式,计算一些稍复杂的图形面积,提高综合应用数学知识和方法解决实际问题的能力。一、找准知识起点,自然引出组合图形组合图形的面积是学生学习了长方形、正方形、平行四边形、三角形和梯形的面积计算的基础上进行教学的,先复习基本图形的面积,
After studying the calculation of the area of the graphic, the fifth-grade students have already got a clear understanding of the area formula and the derivation of the various kinds of the graphic. Based on this, the calculation of the area of the combined graphic focuses on the comprehensive application of the learned area formula and the calculation of some Slightly complicated graphics area increases the ability to apply mathematical knowledge and methods to practical problems. First, identify the starting point for knowledge, naturally leads to the combination of graphics area is a combination of graphics, students learn the rectangular, square, parallelogram, triangle and trapezoidal area calculation basis for teaching, review the basic graphics area,