1.5.14.30.55.91找规律添数答案是140 怎么来的?
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1.5.14.30.55.91找规律添数答案是140 怎么来的?
![1.5.14.30.55.91找规律添数答案是140 怎么来的?](/uploads/image/z/4972336-16-6.jpg?t=1.5.14.30.55.91%E6%89%BE%E8%A7%84%E5%BE%8B%E6%B7%BB%E6%95%B0%E7%AD%94%E6%A1%88%E6%98%AF140+%E6%80%8E%E4%B9%88%E6%9D%A5%E7%9A%84%3F)
0 + 1^2 = 1 1 + 2^2 = 5 5 + 3^2 = 14 14 + 4^2 = 30 30 + 5^2 = 55 55 + 6^2 = 91 91 + 7^2 = 140 An = 1^2 + 2^2 + 3^2 + ...+ n^2