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不久前,笔者听了一节教学研讨课,这节课的内容是“平均数”。上课的教师先创设了第一个情境:第一组男生分别投进球的个数为4、7、6,第一组女生分别投进球的个数为6、5、5。问:是第一组男生投得准还是第一组女生投得准?对于这个问题,学生很容易回答,都是3个人,只要比总数就可以了。接着教师出示第二个情境:第二组男生分别投进球的个数为7、8、6,第二组女生分别投进
Not long ago, I heard a teaching seminar, the content of this lesson is “average ”. Class teachers first created the first situation: the first group of boys were dropped into the ball the number of 4,7,6, the first group of girls were dropped into the ball the number of 6,5,5. Q: Is the first group of boys voted for the first group of girls or prospective? For this problem, students are very easy to answer, all three people, as long as the total number on it. Then the teacher showed a second situation: the second group of boys were dropped into the ball the number of 7,8,6, the second group of girls were dropped