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把复数z的共轭复数记作,若z=1+i,i为虚数单位,则=A.3-iB.3+iC.1+3iD...
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把复数z的共轭复数记作
,若z=1+i,i为虚数单位,则
=( )
A.3-i
B.3+i
C.1+3i
D.3
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