A(x)=x-3/2*x^2+16/3*x^3+2814/4*x^4-1092180/5*x^5+。。。
其中f.A(x)满足:
x/(1-x)=A(x)+A(x”)*A(5*x)/2!+A(x)*A(5*x)*A(5^2*x)/3+
A(x)*A(5*x)*A(5^2*x)*A(5^3*x)/4!+。。。
G(x)=1+5*A(x)+5^2*A(x)*A(5*x)/2+
5^3*A(x)*A(5*x)*A(5^2*x)/3+
5^4*A(x)*A(5*x)*A(5^2*x)*A(5^3*x)/4!+。。。
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