高斯怎么几秒算出1加到100？

Gauss was a very smart schoolboy. 高斯小时候，是个聪明的小学生。 One day his teacher gave the class a hard sum. 有一天，老师出了道难题。 The boys had to add 1 to 100. 要把1到100全部加起来。 Gauss paired the first number with the last. 高斯把头尾两个数配成一对。 Each pair makes 101. 每一对，加起来都是101。 There are fifty pairs in all. 这样的对子，一共有五十个。 He got 5050 in just a few seconds. 没几秒钟，他就算出了5050。