令y=loga(x+√(x^-1)
则a^y=x+√(x^-1)
x√(x)=1÷(a^y-1)
x^3=(a^y-1)^(-2)
x=(a^y-1)^(-2/3)
故f^(-1)(x)=(a^x-1)^(-2/3)
当0