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在五年制数学第七册教材中,对于“平行线”的定义是这样叙述的:在同一个平面内不相交的两条直线叫做平行线。教学时,学生对“不相交”这一比较明显的属性容易理解,而对于“面”“平面”“同一平面”、“在同一个平面内”这些比较抽象的概念难于掌握。怎样针对学生的这一实际情况讲清“平行线”概念呢? 1.以谜语开道,激发学生求知的兴趣。教学一开始,教师便出示谜语:“人家兄弟手拉手,咱们兄弟不碰头,火车在咱肩上跑,高压电在咱身上走。”让学生去猜。学生听完后,个个跃跃欲试,很想把它猜出来,但谁也猜不对。这时,
In the seventh volume of five-year mathematics textbooks, the definition of “parallel lines” is described as follows: Two lines that do not intersect in the same plane are called parallel lines. Students are more apt to understand the more discernible attribute of “disjoint” while teaching, and the more abstract concepts of “sameness”, “sameness” and “in the same plane” are difficult to grasp. How to clarify the concept of “parallel lines” against the actual situation of students? 1. To ridicule, to stimulate students interest in knowledge. At the beginning of the teaching, the teacher presented the riddle: “People and brothers hand in hand, our brothers do not meet, the train running on our shoulders, high-voltage electricity in our body to go.” Let students guess. After listening to the students, all eager to try to guess it, but no one guess. At this moment,