设i是虚数单位,则复数5−6ii=(  ) A.6+5i B.6-5i C.-6+5i D.-6-5i

问题描述:

设i是虚数单位,则复数

5−6i
i
=(  )
A. 6+5i
B. 6-5i
C. -6+5i
D. -6-5i

5−6i
i
=
(5−6i)i
i2

=
5i−6i2
−1

=-6-5i.
故选D.