f(x-1)=x+x^2+x^3+.+x^n(x≠0,1),设f(x)中x的系数为Sn,x^3的系数为Tn,lim(n到∞)(Tn-Sn^2)/(n^4)=
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![f(x-1)=x+x^2+x^3+.+x^n(x≠0,1),设f(x)中x的系数为Sn,x^3的系数为Tn,lim(n到∞)(Tn-Sn^2)/(n^4)=](/uploads/image/z/6923946-66-6.jpg?t=f%EF%BC%88x-1%EF%BC%89%3Dx%2Bx%5E2%2Bx%5E3%2B.%2Bx%5En%28x%E2%89%A00%2C1%EF%BC%89%2C%E8%AE%BEf%EF%BC%88x%EF%BC%89%E4%B8%ADx%E7%9A%84%E7%B3%BB%E6%95%B0%E4%B8%BASn%2Cx%5E3%E7%9A%84%E7%B3%BB%E6%95%B0%E4%B8%BATn%2Clim%EF%BC%88n%E5%88%B0%E2%88%9E%EF%BC%89%28Tn-Sn%5E2%29%2F%28n%5E4%29%3D)
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