>>323
あと少しです
a = 1/2{(b+c)±√3i(b-c)}
ω=(-1+√3i)/2なので、ω^2=(-1-√3i)/2=-(1+√3i)/2
+の方は (1+√3i)/2*b + (1-√3i)/2*c = -bω^2 - cω
-の方は (1-√3i)/2*b + (1+√3i)/2*c = -bω - cω^2