题目内容
复数z=1+i,为z的共轭复数,则z-z-1=
A.-2i
B.–i
C.i
D.2i
B.-i
复数z=1+i,为z的共轭复数,则z·-z-1=________.
( )
(A)-2i (B)-i (C)i (D)2i