六年制小学数学第十二册练习六有这样一道题目: 上图是一个机器零件,求它的体积和表面积。(单位:厘米) 学生在求它的体积时都能受求组合图形面积计算方法的启发,利用圆柱体积加上长方体体积求出。而在求它的表面积时,许多同学受习惯性思维的影响,还试图用圆柱表面积加上长方体表 Sixth-year primary school mathematics twelfth book practice six have such a topic: The figure is a machine parts, and its volume and surface area. (In centimeters) Students are inspired by the method of calculating the combined area of ​​the figure in seeking its volume, using the volume of the cylinder plus the volume of the cuboid. In seeking its surface area, many students by the habitual thinking of the impact, but also trying to use cylindrical surface area plus the rectangular surface