用幂级数展开:
(1+0.5)^0.6=1+0.6*0.5+0.6*(0.6-1)/2*0.5^2+0.6*(0.6-1)*(0.6-2)/3!*0.5^3+0.6*(0.6-1)*(0.6-2)*(0.6-3)/4!*0.5^4+.
=1.2754...