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人教版八年级下册第19章《一次函数》是初中研究函数的起始章节,教材75页写道“有些问题中的函数关系很难列式子表示,但是可以用图来直观地反映,例如用心电图表示心脏部位的生物电流与时间的关系.即使对于能列式表示的函数关系,如果也能画图表示,那么会使函数关系更直观.”因此,通过函数图像研究函数性质,是重要的学习内容.怎样能够研究得法?有三点很重要,一是关注趋势,二是关注特殊值,三是借助运算.
People's Education Edition eighth grade volume, Chapter 19, “a function” is the starting chapter of the junior high school research function, teaching materials 75 pages wrote “Some problems in the function of the relationship between the columnar sub-expression is difficult, but you can use the chart to visually Reflect, for example, the relationship between the bioelectric current of the heart site and the time using an electrocardiogram, and even if the function relation can be drawn, the function relation is more intuitive if the function relation of the column can be expressed. ”Therefore, the function property , Is an important learning content.How can we study the law? There are three important, one is concerned about the trend, the second is concerned with the special value, the third is by means of computing.