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一、案例在长方体的单元复习阶段,我有意设计了如下一道题:如下图,有一个密封玻璃缸,存水的空间长6分米、高4分米,现在缸里的水深3分米。如果缸竖起来,缸里的水深多少分米?读完题,学生们总觉得似乎缺了什么条件。班上此时鸦雀无声,没有一个人举手发言。这时柯××举起了手,站起来问道:“蒋老师,这道题好像少了条件,宽是几分米不知道,这道题就做不了啊!”“对呀,就是没有宽呀!”张××小声的自言自语道。柯××的一问,引起了班上的小小骚动,不少学生都在窃窃私语。这时,我“一本正经”地看了看题目,故意装着疑惑的样子,并把原题从头到尾认真读了一遍,然后郑重地添加了一个条件,使得题目改编成:有一个密封玻璃缸,存水的空间长6分米、宽5分米、高4分米,现在缸里的水深3分米。如果缸竖起
First, the case in the cuboid unit review phase, I intend to design the following questions: The following figure, there is a sealed glass tank, water storage space 6 meters long, 4 meters high, and now the depth of 3 meters in the cylinder. If the cylinder is erected, how many decimeter water depth in the cylinder? Read the questions, students always feel that what seems to be missing conditions. There was no silence at this moment in the class, no one raised his hand to speak. At this time Ke × × raised his hand and stood up and asked: “Jiang teacher, this problem seems to be less than the condition of the width of a few meters do not know, this problem can not do ah!” “” Yeah , Is not wide ah! “Zhang × × whispered to himself. Ke XX asked, causing a small commotion in the class, many students are whispering. At this moment, I looked at the topic ”solemnly" and deliberately pretended to be puzzled and read the original title carefully from start to finish, and then solemnly added a condition that led to the adaptation of the title to: a sealed glass Cylinder, water storage space 6 meters long, 5 meters wide, 4 meters high, and now the depth of 3 meters in the cylinder. If the cylinder is erected