复数z=10i3+i的共轭复数是()A.1+3iB.-1+3iC.1-3iD.-1-3i-数学

题目简介

复数z=10i3+i的共轭复数是()A.1+3iB.-1+3iC.1-3iD.-1-3i-数学

题目详情

复数z=
10i
3+i
的共轭复数是(  )
A.1+3iB.-1+3iC.1-3iD.-1-3i
题型:单选题难度:中档来源:河东区一模

答案

∵复数z=class="stub"10i
3+i
=
10i(3-i)
(3+i)(3-i)
=class="stub"10+30i
10
=1+3i,故它的共轭复数为 1-3i,
故选C.

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