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人教版《义务教育教科书·数学》七年级上册第3.4节探究一的课题是“销售中的盈亏”。原题如下:一商店在某一时间以每件60元的价格卖出两件衣服,其中一件盈利25%,另一件亏损25%,卖这两件衣服总的是盈利还是亏损,或是不盈不亏?笔者从教多年,根据经验,知道学生解决销售方面的实际问题时普遍感到很难,部分学生没有将问题中的“进价”“售价”“成本”“利润”“利润率”等概念弄明白,缺乏相应的生活体验,加上该知识点只有一课
People’s Education Edition “compulsory education textbooks, mathematics,” the seventh grade on the volume section 3.4 to explore a subject is “profit and loss in sales ”. The original is as follows: A shop sells two pieces of clothing at a price of $ 60 a piece at a time, one of them making 25% of the profit and the other 25% of the loss, and selling the two pieces is always profitable or losing money or Is not profitable? I teach for many years, based on experience, know that students solve practical problems in sales generally feel very difficult, some students did not question the “purchase price ” “selling price ” “cost ”“ Profit ”“ profit margins ”and other concepts to understand, the lack of corresponding life experience, coupled with the knowledge of only one lesson