Gaokao Math Practice Question
设 $a, b \in R$ 且 $b \neq 0$, 若复数 $(a+b i)^{3}$ 是实数, 则($\qquad$)
- A.$b^{2}=3 a^{2}$
- B.$a^{2}=3 b^{2}$
- C.$b^{2}=9 a^{2}$
- D.$a^{2}=9 b^{2}$
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