“柱体”概念有定义吗?

• 作 者: 郭乃光
• 机 构: 永新中学
• 出 处: 江西教育
• 发表日期: 2004年期
• 关键词: 小学数学教师 体积公式 计算公式 中学教学 定曲线 平行平面 王文才 桂芬 分类表

有些小学数学教师在复习几何体时,把正方体、长方体、圆柱归纳为柱体,并把体积公式归纳为一个统一的柱体体积计算公式V_(柱体)=Sh。而另有一些教师就“柱体”定义提出了异议,认为:1.在初等数学里很难给柱体下个确切定义;2.能够利用柱体公式V_(柱体)=Sh进行计算的一些图形(如图)不是柱体。如果看成是柱体,将会引起概念上的混乱;

Some elementary school mathematics teachers in the review of geometry, the cube, cuboid, cylinder summarized as a cylinder, and the volume formula is summarized as a uniform column volume calculation formula V_ (cylinder) = Sh. Some other teachers proposed objections to the definition of “cylinder”: 1) it is very difficult to define the cylinder exactly in elementary mathematics; 2) the cylinder formula V_ (cylinder) = Sh can be used to calculate Some graphics (pictured) are not cylinders. If viewed as a pillar, it will cause conceptual confusion;