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一个好的练习，既能巩固学生对知识的理解，又能使知识转化为技能技巧，还能训练学生思维的准确性和灵活性，发展学生的智力，培养学生获取知识解决问题的能力，从而全面提高质量。一定量的练习是必要的，从某种意义上讲，练得多可以加快形成技巧，但是机械重复地多练，容易引
A good exercise can not only consolidate students' understanding of knowledge, but also make knowledge into skills and skills. It can also train students' accuracy and flexibility in thinking, develop students' intelligence, and develop their ability to acquire knowledge and solve problems. Improve overall quality. A certain amount of practice is necessary, in a sense, practicing much can speed up the formation of skills, but the machine repeatedly more practice, easy to lead