Gaokao Math Practice Question
已知 $z=1-2 i$, 且 $z+a \bar{z}+b=0$, 其中 $a, b$ 为实数, 则 ($\quad$)
- A.$a=1, b=-2$
- B.$a=-1, b=2$
- C.$a=1, b=2$
- D.$a=-1, b=-2$
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