Amigo3 1) -1/2-3/2i=-0,5-1,5/i=-0,5+1,5*i≈1,581*exp(i*arctg(-3)).
2) 3-i≈3,162*exp(i*arctg(-1/3)).
3) 1,581*exp(i*(arctg(-3)-arctg(-1/3))/3,162=0,5*exp(-i*0,927)
4) (0,5*exp(-i*0,927))³=-0,117-0,044i