望采纳
Z=1-2i/2+i=(1-2i)(2-i)/(2+i)(2-i)=-3i/5,虚部应该是负五分之三i
z=1—2i/2+i =1-2i(2-i)/(2+i)(2-i) =1-(4i+2)/5 =3/5-4i/5 虚部是-4/5
-3i不谢
-4/5