解题不仅仅是为了做对一道题，更多的是为了巩固对知识的理解，积累解题经验，强化解题方法，发现解题规律，掌握解题策略，形成解题意识，培养坚忍不拔、锲而不舍的意志品质.波利亚说过，中学数学首要的任务就是加强解题训练，他有一句名言:“掌握数学就是意味着善于解题”，在这里，“解题”近于“掌握数学”的同义词了.波利亚把教会学生解题看做是教会学生思考，培养他们独立探索能力的一条主要途径。
There are also many values describing the trend of data deviation， such as variance， range， percentile， interquartile， and interquartile range. Here is an introduction to the quartiles. Arrange the data from small to large and divide it into quarters. The number at the three division points is the quartile. The quarterback distance is the difference between the third quartile and the first quartile.
