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教师在教学实践中动手操作或让学生自己动手操作,最能唤起学生的兴趣,保持学生稳定的注意力。如在推导圆柱体的体积公式时,笔者通过让学生自己推导将一个圆柱体拼割成一个近似的长方体,并让学生掌握了圆柱体的体积公式后,笔者要求学生认真观察教师的推导过程,并让学生观察将一个圆柱体拼割成一个近似的长方体后,这个近似的长方体的体积、表面积同原来的圆柱体的体积及表面积相比是否发生变化。
Teachers in teaching practice or let students operate their own hands, the most arouse the interest of students, to maintain a stable student attention. As in the derivation of cylinder volume formula, the author deduces a cylinder by the students themselves deduced into an approximate cuboid, and allow students to master the cylinder volume formula, the author requires students to carefully observe the teacher’s derivation process, And let the students observe a cylinder is divided into an approximate rectangular box, the approximate cuboid volume, surface area with the original cylinder volume and surface area compared to whether the change.