$\frac{1+2 i}{1-2 i}=(\qquad)$
Gaokao · Math · previous-year question
- A.$-\frac{4}{5}-\frac{3}{5} i$
- B.$-\frac{4}{5}+\frac{3}{5} i$
- C.$-\frac{3}{5}-\frac{4}{5} i$
- D.$-\frac{3}{5}+\frac{4}{5} i$
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