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两位教师执教同样的课题:解决问题的策略——假设。他们创设了同样的情境:“720毫升果汁刚好倒满9个小杯,每个小杯能装多少毫升果汁?”学生口答后再出示:“720毫升果汁正好倒满3个大杯,每个大杯能装多少毫升果汁?”学生同样顺利地进行了解答。所不同的是接下来的处理方式。第一位教师接着出示:“720毫升果汁正好倒满了6个小杯和1个大杯,每个小杯的容积是大杯的13,每个小杯和每个大杯分别能装多少果汁?”现在你还能解答吗?题目告诉了我们哪些条件?哪一句是关键句?……枯燥乏味的教学由此展开。
The two teachers coached the same topic: Strategies for Problem Solving - Assumptions. They created the same situation: “720 ml juice just fills nine small cups, each small cup can hold the number of ml of fruit juice?” “Students replied after the answer: ” 720 ml juice just filled 3 large cups How many ml of fruit juice can each cup hold? “” Students answered the same questions smoothly. The difference is the next approach. The first teacher went on to show: “720 ml of juice just fills up 6 small cups and 1 large cup, each small cup has a capacity of 13 large cups, and each small cup and each large glass can hold How many juices? ”Now you can answer it? Subject told us what conditions? Which sentence is the key sentence? ... From the boring teaching.