我们知道 ,数字问题用算术方法解比较困难 ,用方程法去解比较简便 ,但若用正确的逻辑思维去进行分析也会使解法很简便。现举例如下 :例 1　一个两位数 ,十位上的数字比个位上的数字少 1,十位数字与个位数的和是这个两位数的15 ,求这个两位数。解法一、(方程法 ) :设十位数字为 We know that it is more difficult to solve numerical problems by using arithmetic methods. It is easier to use the equation method to solve, but if you use the correct logical thinking to analyze, it will make the solution very simple. Examples are as follows: Example 1 A two-digit number where the number on the tens is less than the number on the one-digit number. The sum of the tens-digit and single-digit number is the 15 of the two-digit number. Find the two-digit number. Solution 1, (equation method): Let ten digits be