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以一次函数为背景的信息题越来越受到中考命题者的青睐,特别是在全国各地课改区的中考试题中屡屡出现.请看下面两类信息题.一、表格信息题例1已知某山区的平均气温与其海拔高度的关系见下表.(1)若海拔高度用x(m)表示,平均气温用y(℃)表示,试写出y,与x之间的函数关系式:(2)若某种植物适宜生长在18℃-20℃的(包含18℃,也包含20℃)
The information subject with the background of a function is increasingly favored by the candidates of the examination candidates, especially in the examination questions in the curriculum reform areas across the country. Please see the following two types of information questions. First, the form information example 1 is known. The relationship between the average temperature in a mountain area and its altitude is shown in the following table. (1) If the altitude is represented by x (m), the average temperature is expressed by y (°C), and try to write the functional relationship between y and x: (2) If a plant is suitable for growth at 18°C to 20°C (including 18°C, also including 20°C)