题目内容
设i为虚数单位,则
=( )
5-i |
1+i |
A.-2-3i | B.-2+3i | C.2-3i | D.2+3i |
∵
=
=
=2-3i
故选C.
5-i |
1+i |
(5-i)(1-i) |
(1+i)(1-i) |
4-6i |
2 |
故选C.
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设i为虚数单位,则
=( )
5-i |
1+i |
A、-2-3i | B、-2+3i |
C、2-3i | D、2+3i |