一位教师在教学北师大版数学第八册中的《探索与发现(一)三角形的内角和》一课时,当教师准备让学生进行巩固练习时,一只小手突然举起,打断了教学——“老师,我还想知道四边形、五边形、六边形的内角和各是多少?”全班同学顿时沉寂了,三十多双好奇的眼睛“唰”地投向这位教师,他们在等待着老师怎样处理这个调皮的学生。正在听课者为这位教师捏了一把 A teacher in the teaching of the eighth edition of the Beijing Normal University Mathematical Book “exploration and discovery (a) triangle’s interior and” a class, when the teacher prepares students to consolidate practice, a small hand suddenly raised, interrupted Teaching - “teacher, I also want to know the quadrilateral, pentagonal, hexagonal angle and how much?” The classmates suddenly quiet, more than thirty pairs of curious eyes The teacher, they are waiting for the teacher how to deal with this naughty student. The teacher is pinching the teacher