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这一单元主要讲加、减、乘、除法竖式中的数字谜的问题。它的解法与横式数字谜基本相同。解题时我们要认真分析算式中隐含的数量关系,选择有特征的部分作为解题的突破口。作出局部的判断是解数字谜的关键。同时,在采用试验的方法时,常常要借助估算的方法,对某些数字进行合理的估计,逐步排除一些可能的数值,缩小所求数字的取值范围,这样可以加快解题的速度。
This unit focuses on the addition, subtraction, multiplication and division of the vertical digital puzzle problem. Its solution is basically the same as horizontal puzzle. When solving problems, we must carefully analyze the relationship between the number of implicit in the formula, select the characteristic part of the problem-solving as a breakthrough. Making a partial judgment is the key to solving a numerical puzzle. At the same time, when using experimental methods, it is often necessary to make reasonable estimations of certain figures by means of estimation, gradually eliminate some possible values and narrow the range of numbers to be requested, so as to speed up the solution to problems.