Z^3=1
Z^3-1=0
(Z-1)(Z^2+Z+1)=0
(Z-1)=0 或(Z^2+Z+1)=0
Z=1
Z^2+Z+1=0
Z^2+Z+(1/2)^2-(1/2)^2+1=0
(Z+1/2)^2=-3/4
Z+1/2=±√(-3/4)
Z=-1/2±√3i/2
Z=(-1±√3i)/2
Z^3=1
Z^3-1=0
(Z-1)(Z^2+Z+1)=0
(Z-1)=0 或(Z^2+Z+1)=0
Z=1
Z^2+Z+1=0
Z^2+Z+(1/2)^2-(1/2)^2+1=0
(Z+1/2)^2=-3/4
Z+1/2=±√(-3/4)
Z=-1/2±√3i/2
Z=(-1±√3i)/2