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根据已知条件来确定某个自然数,是初中数学竞赛中常见的一种题型,要想求得正确的结果,必须全面地观察、分析问题,寻找解题的突破口是解决问题的关键,下面试举例来说明。例1 abcd是一个四位的自然数,已知abcd-abc-ab-a=1995,试确定这个四位数abcd. (1995年北京市中学生数学竞赛初二试题) 解为了便于分析,我们可将已知横式改列竖式,可得
Determining a certain natural number based on known conditions is a common type of problem in the junior high school math competition. If you want to obtain correct results, you must observe and analyze the problem in a comprehensive manner, and finding the breakthrough point for solving the problem is the key to solving the problem. Interview examples to illustrate. Example 1 Abcd is a four-digit natural number, known as abcd-abc-ab-a=1995, which was determined to be the four-digit abcd. (For the 1995 Beijing Junior High School Mathematics Competition, the second test question) For the sake of analysis, we can Known horizontal change to vertical type, available