Cho z = 1 + 3i .Tính \(\frac{1}{z}\)

Câu hỏi: Cho z = 1 + 3i .Tính \(\frac{1}{z}\)

A. \(\frac{1}{{10}} + \frac{3}{{10}}i\)

B. \(\frac{1}{{10}}i - \frac{3}{{10}}\)

C. \(\frac{1}{{10}} - \frac{3}{{10}}i\)

D. \( - \frac{1}{{10}} - \frac{3}{{10}}i\)