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近年来,中考数学更强调基础性,注重考查学生的观察、实践能力,因此很多省市在中考题中都出现了有关一次函数的图象信息题.现仅就2004年部分省市的中考题目对该类题进行分析. 例1 我国很多城市水资源缺乏,为了加强居民的节水意识,某市制定了每月用水4吨以内(包括4吨)和用水4吨以上两种收费标准(收费标准:每吨水的价格),某用户每月应交水费y(元)是用水量x(吨)的函数,
In recent years, the mathematics of the senior high school entrance examination emphasizes the basics and focuses on the observation and practical ability of the students. Therefore, many provinces and cities have appeared in the examination questions about the image information of the first function. Now only the examination subjects of some provinces and cities in 2004 The analysis of this type of problem. Example 1 Many cities in China lack of water resources. In order to strengthen residents’ awareness of water conservation, a city has formulated two kinds of charging standards (including 4 tons) and 4 tons of water for monthly use (charges). Standard: the price per ton of water), a user’s monthly water fee y (yuan) is a function of water consumption x (tons),