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图象条件的一次函数应用题是初中数学学习中的一个重点和难点,在近年来的中考中屡见不鲜.解答它们,应认真读题,观察图象,并把其中一些特殊点的横坐标和纵坐标都找出来.如果对应的图象是折线,要注意看看折线能分解为哪些线段或射线,并理解它们所表示的实际意义.例1一辆警车在高速公路的A处加满油,以每小时60千米的速度匀速行驶.已知警车一次加满油后,油箱内的剩余油量y(升)与行驶时间x(小时)的函数关系的图象为如图所示的直线l上的一部分.
The application of the first order function of the image condition is one of the most important and difficult points in junior high school mathematics learning, and it is not uncommon for the middle school entrance examinations in recent years to answer them. They should carefully read the questions, observe the images, and take some of the abscissa and longitudinal Coordinates are found out .If the corresponding image is a polyline, pay attention to see the broken line can be broken down into what lines or rays, and understand what they mean.Example 1 A police car in highway A filled with oil, At a constant speed of 60 km / h, it is known that the image of the residual fuel amount y (liter) in the fuel tank as a function of the travel time x l on the part.