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学习函数知识要会利用列表法、解析法、图象法表示出函数的关系,特别是同一个函数关系用这三种方法逐一表示,并明了这些表示方法之间的关系是非常重要的,下面我们通过一个例题来分析函数的关系.例1如图1,在矩形ABCD中,AB=10cm,BC=8cm,点P从A出发,沿A→B→C→D路线运动,到D停止;点Q从D出发,沿D→C→B→A路线运动,到A停止,若点P、点Q同时出发,点P的速度为每秒1cm,点Q的速度为每秒2cm,a秒时点P、点Q同时改变速度,点P的速度变为每秒bcm,点Q的速度为每秒dcm,图2是点P出发x秒
Learn the knowledge of the function to use list method, analytic method, image method to express the function of the relationship, in particular the same function with these three methods one by one, and understand the relationship between these methods is very important, the following Example 1 As shown in Figure 1, in a rectangular ABCD, AB = 10cm, BC = 8cm, point P starting from A, moving along A → B → C → D, and stopping at D; Point Q starting from D, moving along D → C → B → A route to stop A, if point P, point Q starting at the same time, the speed of point P is 1cm per second, the speed of point Q is 2cm per second, a second When point P, point Q changes speed at the same time, the speed of point P becomes bcm per second, the speed of point Q is dcm per second, Figure 2 is the point P starting x seconds