论文部分内容阅读
众所周知,一次函数y=kx+b(尼≠0)的自变量x的取值范围是全体实数,图象是一条直线,但在实际问题中,由于自变量取值受到限制,它的图象也并非直线,而许多同学往往忽视了这一点,导致画图象出错,下面举例说明实际问题中一次函数图象的几种情形.一、图象是线段例1 汽车由天津驶往相距120千米的北京,它的平均速度是30千米/时,求汽车距北京的路程S(千米)与行驶时间t(时)的函数关
It is known that the value of the independent variable x of the primary function y=kx+b (Nil 0) is the entire real number, the image is a straight line, but in practical problems, due to the limited value of the independent variable, its image It is not a straight line, and many students often overlook this, leading to the wrong picture. Here are some examples of the actual function in a function image. First, the image is a line segment Example 1 Cars drive from Tianjin to a distance of 120 thousand In Beijing, the average speed is 30 km/h, and the distance between the car’s distance from Beijing S (km) and the driving time t (hours) is