已知z是纯虚数,
是实数,那么z虚部等于( )
A. 2i
B. -2i
C. 2
D. -2
人气:369 ℃ 时间:2019-12-16 03:45:30
解答
设复数z=ai,a∈R,则
===它是实数,所以a=-2
故选D.
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