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前面,我们由(a+b)2=a2+2ab+b2这个很简单的公式出发,居然推导出从1开始的前n个自然数的和,平方的和.立方的和,即
In the foregoing, we proceed from the very simple formula (a+b)2=a2+2ab+b2. We actually derive the sum of the first n natural numbers starting from 1, the sum of the sum of squares.