A(x)=1+x+1/4*x^2-1/54*x^3-19/4608*x^4+-。。。
A(x)^(1/2)=1+1/2*x+0*x^2-1/108*x^3+71/27648*x^4-+。。。
A(x)^(1/3)=1+1/3*x-1/36*x^2+0*x^3+13/13824*x^4-+。。。
A(x)^(1/4)=1+1/4*x-1/32*x^2+11/3456*x^3+0*x^4-+。。。
A(x)的初始系数为:
-64667/233280000, 1752946877/213462345600000,
796654376069593/71945836874956800000,
-1318782726516512640001/301100369020478344396800000,
3482456481351141439684019/3345559655783092715520000000000, ...}.