Question - Summation Calculation Using Pairing Method
Solution:
题目要求计算一系列数字相加的和：$$23 + 20 + 19 + 22 + 18 + 21$$首先我们可以将数字两两配对，这样可以更快的计算出结果：$$23 + 20 = 43$$$$19 + 22 = 41$$$$18 + 21 = 39$$现在将它们加起来：$$43+ 41 + 39 = 123$$所以这些数字加起来的和为123。
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