复数3-ii(i为虚数单位)等于()A.-1-3iB.-1+3iC.1-3iD.1+3i-数学

题目简介

复数3-ii(i为虚数单位)等于()A.-1-3iB.-1+3iC.1-3iD.1+3i-数学

题目详情

复数
3-i
i
(i为虚数单位)等于(  )
A.-1-3iB.-1+3iC.1-3iD.1+3i
题型:单选题难度:中档来源:绍兴模拟

答案

class="stub"3-i
i
=
(3-i)•(-i)
i•(-i)
=-1-3i
故选A

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