如18和81,42和24……每组中的一个两位数都是另一个两位数的倒转数。本文所说的倒转数特指两位数。两个倒转数间的联系是有一定规律的。我们设a和b是两个不相同的数字,它们可以组成一个两位数ab。因为a在十位上,它表示a个10,写作10a,两位数ab也就是(10a+b)。a和b还可以组成两位数ba,它们是两位数ab的倒转数。同样,可以写成10b+a。我们把两位数ab和它的倒转数相加,它们 Such as 18 and 81, 42 and 24 ... ... each two digits in each group are the other two-digit reversal number. In this article, the number of inversions refers to double digits. The relationship between the two inverted number is a certain law. We assume that a and b are two different numbers, they can form a two-digit ab. Since a is in the tens place, it means that a is 10, writing 10a, and the two-digit ab is (10a + b). A and b can also form a two-digit number ba, which is the inverse of the two-digit number ab. Similarly, you can write 10b + a. We add the two-digit ab to its inverse and add them