>
数学
>
设z的共轭复数是
.
z
,若
z+
.
z
=4
,
z•
.
z
=8
,则
.
z
z
等于( )
A. i
B. -i
C. ±1
D. ±i
人气:329 ℃ 时间:2020-04-03 08:00:13
解答
本小题主要考查共轭复数的概念、复数的运算.可设
.
z
=2+bi
,由
z•
.
z
=8
得4+b
2
=8,b=±2.
.
z
z
=
.
z
2
8
=
(2±2i)
2
8
=±i.
选D
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