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形如y=kx+b(k≠0)的函数叫做一次函数,其性质为:(1)当k>0时,y随x的增大而增大;(2)当k<0时,y随x的增大而减小.借助一次函数的上述性质,常常可顺利地求解一些实际问题.例1在边防沙漠地带,巡逻车每天行驶200千米,每辆巡逻车可装载供行驶14天的汽油.现有5辆巡逻车同时从驻地A出发,完成任务后再沿原路返回驻地.为了让其中3辆尽可能向更远的距离巡逻,然后再一起返回,甲、乙两车行到途中B处后,仅留足自己返回驻地
The function of a form such as y = kx + b (k ≠ 0) is called a linear function, and its properties are: (1) when k> 0, y increases with the increase of x; (2) y decreases with the increase of x. With the above properties of the linear function, some practical problems can often be successfully solved.Example 1 In the border desert areas, patrol cars travel 200 kilometers per day, each patrol car can be loaded for driving 14 Days of the existing five patrol cars starting from the station at the same time, to complete the mission and then return to the original location along the road.To make the three as far as possible to patrol the farther distance, and then return together, A and B vehicles After the trip to the B Department, leaving only their own return to the resident