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设a,b为实数,若复数,则A.a=2,b=1B.a=2,b=-1C.a=1,b=2D.a=...
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设a,b为实数,若复数
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)
,则( )
A.a=2,b=1
B.a=2,b=-1
C.a=1,b=2
D.a=1,b=-2
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