\[1)\ (5 + 4i) + ( - 2 + 3i) = 3 + 7i;\]
\[2)\ (1 + 5i) + (6 - 7i) = 7 - 2i;\]
\[3)\ (0,5 - 3,2i) + (1,5 - 0,8i) =\]
\[= 2 - 4i;\]
\[4)\ ( - 1 - 2i) + 3i = - 1 + i;\]
\[5)\ \left( 3 + \sqrt{5}i \right) + \left( 3 - \sqrt{5}i \right) = 6;\]
\[6)\ \left( \frac{1}{3} - \frac{1}{2}i \right) + \left( - \frac{1}{3} - \frac{1}{2}i \right) = - i.\]