论文部分内容阅读
在应用题中,经常可见到一些特殊行程问题,题设中只给出路程、速度、时间三种量中的一种,最后要求的也是这种量。为了找出等量关系,需要表示另外两种量,初看之下不易入手。通常可采用添设辅助未知量的办法,用来沟通各个量的关系,而辅助未知量可以在解方程或方程组的过程中消去。但有时也可采用类型转换的办法或者挖掘题意中的隐含
In the application questions, some special trip problems can often be seen. Only one of the three types of distance, speed, and time is given in the title setting. The final request is also such a quantity. In order to find out the equal relationship, it is necessary to express the other two kinds of quantities. It is difficult to start at first sight. Usually, the method of adding auxiliary unknowns can be used to communicate the relationships among various quantities, and the auxiliary unknowns can be eliminated during the process of solving equations or equations. But sometimes it is also possible to use type conversion methods or to hide implicit meanings