x=t
t²+2t-ti+2mi+1=0
所以t²+2t+1=0
-t+2m=0
t=-1,m=-1/2
(-1/2+i)/(1-i)
=(-1/2+i)(1+i)/(1+i)(1-i)
=(-3/2+i/2)/(1+1)
=-3/4+i/4
所以共轭虚数是-3/4-i/4