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
答
=5−6i i
(5−6i)i i2
=
5i−6i2
−1
=-6-5i.
故选D.