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由于美国中学采用学分制,中学生可以根据自己的需要,所学的专业(或毕业后的目标)选学各门课程,因此高中毕业时,数学水平会相差较大。又由于美国中学不采用统一的教材,各个州,各个学校可自行选择数学课本,这就形成了美国中学数学教材的多样化的特点。为了高等教育的需要,或者继续进行某种专业工作的需要,就有必要将基础数学知识进行整理,
Because American middle schools use the credit system, middle school students can choose courses according to their own needs and the major they are studying (or after graduation). Therefore, when they graduate from high school, mathematics levels will differ greatly. Because U.S. middle schools do not use uniform teaching materials, each state and each school can choose math textbooks on its own, which forms the diverse characteristics of American middle school mathematics textbooks. For the needs of higher education, or the need to continue a certain professional work, it is necessary to sort out basic mathematics knowledge.