设计好练习题是十分关键的一环。练习题的设计要求表述有亲和力,让学生体会生活中处处有数学,教学目标指向每个学生的“最近发展区”。练习要有利于总结规律,并能为后续知识学习埋下伏笔,答案不唯一的开放题是学生最喜欢做的。 Design exercises is a very crucial part. The design of the exercise requires an expression of affinity for the student to have math in his / her life. The teaching objective points to each student’s “recent development zone.” Practice should be conducive to the conclusion of the law, and can pave the way for follow-up knowledge learning, the answer is not the only open question is the students most like to do.