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学会从实际问题列代数式,是列代数式的重点,也是难点.学会从实际问题列代数式的关键是:了解实际问题中的数量关系,能把这种数量关系转化为代数式. 本文以实际问题为例,谈淡这个问题(举例均选用各地中考试题). 一、市场营销问题例1 某商品价格为a元.降价10%后,义降价10%,销售额猛增.商店决定再提价20%,提价后这种商品价格为( ).
Learning to list algebraic expressions from practical problems is an important and difficult point in the algebraic formula. The key to learning to list algebraic expressions from practical problems is to understand the quantitative relationships in practical problems and to convert these quantitative relationships into algebraic ones. , to talk about this problem (examples are selected throughout the test questions). First, the marketing problem Example 1 The price of a commodity is a yuan. After a price reduction of 10%, Yiyi price 10%, sales soared. The store decided to raise the price by 20%. After the price increase, the price of this product is ().