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在我们的平时教学生活中,时常会听到老师这样的怨言:“这一题,我都讲过好几遍了,学生还是错,教不会呀!”“这一题其实很简单,但是还是有很多人不会。”……老师讲了,学生就会吗?面对这样的困惑,我们应该冷静地思考现象背后的原因,找到解决问题的方法。在六年级“长、正方体的体积”单元的练习中,有这样一题:一个长方体玻璃缸,从里面量长是25厘米、宽是12厘米、高是30厘米,里面装有水,此时水面高12厘米,放入一个棱长9厘米的正方体铁块(完全浸
In our usual teaching life, teachers often hear such complaints: “This question, I have talked about several times, the student is still wrong, will not teach it! ” “This question is actually very simple , But still a lot of people do not. ”“ ... When the teacher said, would the students? Faced with such confusion, we should think calmly about the reasons behind the phenomenon and find solutions to the problems. ” In the sixth grade “long, cube volume ” unit exercises, there is such a question: a rectangular parallelepipedic glass cylinder, the inside length is 25 cm, width is 12 cm, height is 30 cm, which contains water, At this time the water surface height 12 cm, into a prism length of 9 cm square iron (completely immersed