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日前,我听了一位青年教师教学《圆锥认识和体积计算》。推导圆锥体积公式,实验分二组,一组圆锥里装满沙子,然后往等高等底圆柱容器倒。另一组用盛满沙子圆柱往等底等高圆锥容器倒。由于实验前没有讲清楚注意问题。结果压得实实的盛满沙子圆柱,三个圆锥倒了后,圆柱里还留下好多沙子。实验结果两组不一样,因此学生对书上结论表示疑惑,教师就照书上下了结论。依我之见,教师应采用亡羊补牢的方法,指着圆柱说:“如果圆柱容器里装的是水,
Recently, I listened to a young teacher teaching “cone understanding and volume calculation.” Cone Volume Formula is derived, the experiment divided into two groups, a group of cones filled with sand, and then to the bottom of the tank at the end of higher inverted. The other group was filled with sand cylinders to the bottom of the conical container. Because before the experiment did not make it clear that attention problems. The result was filled with sand column, three cones down, the column also left a lot of sand. Experimental results The two groups are not the same, so the students expressed doubts about the conclusions of the book, the teacher took the book up and down the conclusion. In my opinion, teachers should adopt remedial measures, pointing to the cylinder, said: "If the cylindrical container is filled with water,