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人教版七年级数学(上册)课本102页有这样的一道探究题: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%,卖这两件衣服总体上是盈利还是亏损,或是不盈不亏?课本的解答是这样的:设盈利25%的那件衣服的进价是x元,它的商品利润就是0.25x元,根据进价与利润的和等于售价,列出方程
PEP (7th grade) Textbook (Vol. 102) There is an inquiry into this topic: A store sells two garments at a price of 60 yuan at a time, one of which is 25% profitable and the other a loss of 25 %, Selling these two clothes in general is profitable or loss, or not profitable? Textbook solution is this: set the 25% profit that clothes purchase price is x yuan, its product profit is 0.25x Yuan, according to the purchase price and profit is equal to the sum of the price, list the equation