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这里的倒转数是对两位数而言的,两个不相同的数字,由于每个数字所在数位不同,因而可以组成两个不相同的两位数。例如18和81,42和24,35和53,87和78……每组中的一个两位数都是另一个两位数的倒转数。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,因为b在十位上,它表示b个10,就是10b,两
The number of inversions here is for two digits, two different numbers, and each digit can be composed of two different numbers because of its different digits. For example, 18 and 81, 42 and 24, 35 and 53, 87 and 78 ... Each of the two digits in each group is the reverse of the other two 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. Again, since b is in the tens place, it means b 10, that is 10b, two