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函数图象是学习函数性质的基础知识和基本技能,图象是沟通函数解析式与性质的桥梁。因此,学好函数图象对深刻掌握函数的性质,学会解题方法,提高解题技能具有十分重要的意义。现通过近年的几个中考题解读反比例函数图象应用的几个层次。一、识图例1(漳州):矩形面积为4,它的长与宽之间的函数关系用图象大致可表示为()解析:由题意xy=4,即y是x的反比例函数,图象B和C都是反比例函数图象,但图象B的自变量取值范围是x>0,选B。
Function image is the basic knowledge and basic skills of learning function. Image is the bridge of analytical function and nature of communication function. Therefore, to learn the function image has a very important meaning for grasping the nature of the function, solving the problem solving method and improving the problem-solving skills. Through several recent senior high school entrance examination questions interpretation of inverse-proportion function image several levels of application. Figure 1 (Zhangzhou): Rectangular area of 4, its length and width of the functional relationship between the image can be roughly expressed as () Analysis: by the title xy = 4, that is, y is inversely proportional to x, The images B and C are all inversely proportional images, but the values of the variables in image B are x> 0,