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Gaokao Math Practice Question

2. 已知 $z=1-2 i$ ，且 $z+a \bar{z}+b=0$ ，其中 $a, b$ 为实数，则（)

  1. A.$a=1, b=-2$
  2. B.$a=-1, b=2$
  3. C.$a=1, b=2$
  4. D.$a=-1, b=-2$

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