(1)i=cos(π/2)+isin(π/2)====>(8i)^(1/3)=2cos[(π/2+2kπ)/3]+i*2sin[(π/2+2kπ)/3](k=0,1,2).(2)轨迹方程：x^2+(y-1)^2=2.(y>0.) (1)i=cos(π/2)+isin(π/2)====>(8i)^(1/3)=2cos[(π/2+2kπ)/3]+i*2sin[(π/2+2kπ)/3](k=0,1,2).(2)轨迹方程：x^2+(y-1)^2=2.(y>0.)