问题
选择题
复数z1=1+i,z2=2-i,则
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答案
∵
=(1+i)2=2i,∴z 21
=z 21 z2
=2i 2-i
=2i(2+i) (2-i)(2+i)
=--2+4i 5
+2 5
i.4 5
故选C.
复数z1=1+i,z2=2-i,则
|
∵
=(1+i)2=2i,∴z 21
=z 21 z2
=2i 2-i
=2i(2+i) (2-i)(2+i)
=--2+4i 5
+2 5
i.4 5
故选C.