复数3+2i2-3i-3-2i2+3i=()A.0B.2C.-2iD.2i-数学

题目简介

复数3+2i2-3i-3-2i2+3i=()A.0B.2C.-2iD.2i-数学

题目详情

复数
3+2i
2-3i
-
3-2i
2+3i
=(  )
A.0B.2C.-2iD.2i
题型:单选题难度:中档来源:宁夏

答案

class="stub"3+2i
2-3i
-class="stub"3-2i
2+3i
=
(3+2i)(2+3i)
(2-3i)(2+3i)
-
(3-2i)(2-3i)
(2+3i)(2-3i)
=class="stub"13i
13
-class="stub"-13i
13
=i+i=2i.
故选D.

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