0 + 1^2 = 11 + 2^2 = 55 + 3^2 = 1414 + 4^2 = 3030 + 5^2 = 5555 + 6^2 = 9191 + 7^2 = 140 An = 1^2 + 2^2 + 3^2 + ... + n^2
很高兴为你解答 n2-n1=2*2n3-n2=3*3依次类推
