关于求取值范围的问题比较常见的有两种类型:一种类型是满足题目所提出的条件的临界状态只有一种,所求的物理量只和一个值有关;一种类型是满足题目所提出的条件的临界状态有两种,那么所求的物理量的取值范围就和两个值有关,但不一定处于两个值之间.一.取值范围和一个值有关例1一辆货车以速度v1匀速前进,货车司机看到在他的 There are two types of problems that are commonly found on the range of values: one type that satisfies one of the critical conditions of the proposed condition, and only one value relates to the physical quantity sought. One type satisfies the problem The conditions of the critical state there are two, then the physical value of the range of values ​​and the two values ​​related, but not necessarily between the two values.A range of values ​​and a value of Example 1 a truck to Speed ​​v1 uniform speed forward, truck drivers saw at him