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换(填)数问题是一类智力问题.这类问题可以通过观察,反复尝试的办法找到答案.但仅仅用这种方式来解决确是一种笨办法,有时甚至很困难.本文通过例题介绍几种解题线索供参考.一、建立未知与已知间的(等量)关系例1把图1中的“中学生”三个字换成与已知数不同且互不相等的一位数,使外面两个大相似三角形三个顶点及三条直线上圆圈里的三个数字之和都相
The problem of changing the number of fillings is a kind of intellectual problem, which can be found through observation and trial and error, but it is a stupid way and sometimes difficult to solve in this way. Several clues to solve the problem for reference.First, the establishment of unknown and known relationship (equivalent) Example 1 in Figure 1 “middle school students ” three words into a known number with different and unequal from one The number of digits so that the sum of the three vertices of the two outer triangles and the three digits of the three straight lines