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顾名思义,“倒推法”就是从后往前想,从结果向前推,逆流而上寻得源头。用“倒推法”解决问题时通常从最后的结果出发,合理运用加与减,乘与除之间的互逆关系,按“有序整理、按序倒推、顺序检验”三个步骤进行,直到解决问题为止。有时为了使思路更清晰,还要借助图示以理清方向,达到解决问题的目的。例如:一辆公共汽车从起点开出时车上有一些乘
As the name suggests, “Reversed Law ” is from behind to think, pushed forward from the results, upstream and found the source. In order to solve the problem with “backstepping method ”, we usually proceed from the final result and make rational use of the reciprocal relationship between addition and subtraction, multiplication and division, orderly sorting, orderly backward, order checking Three steps are taken until the problem is solved. Sometimes in order to make the idea clearer, but also to help clear the direction of the icon to achieve the purpose of solving the problem. For example: a bus from the starting point when there are some ride in the car