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變形:(1^2-0)/2^2 -(2^2-1)/3^2(3^2-2)/4^2 -(4^2-3)/5^2(5^2-4)/6^2現在看明白了吧?下一項是-(6^2-5)/49=-31/49通項公式:an=(-1)^(n+1)[n^2-(n-1)]/(n+1)^2=(-1)^(n+1)(n^2-n+1)/(n+1)^2
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