写文章有“凤首、猪肚、豹尾”之说,一节课亦如此。数学的导入和结课是一种教学艺术,它可以融知识性、趣味性、思想性、艺术性于一体,巧妙的使用好课始导入和结课,无论是激发学生的学习兴趣,还是帮助学生学习数学知识都是有益的。课始的教学设计得好,就会点燃学生学习欲望,获得一举成功之效;课末的教学 Writing articles have “Feng first, pig stomach, leopard tail ” said, a lesson is also true. The introduction and finalization of mathematics is a kind of teaching art, which can integrate knowledge, interest, thoughtfulness and artistry into a whole. It can be used skillfully to start and finish lessons. Whether it is to stimulate students’ interest in learning or to help students to learn Mathematical knowledge is helpful. The beginning of the teaching design is good, it will ignite the students desire to learn, one stroke of the success of the effectiveness of teaching at the end of the class