\[1)\ (3 + 4i) - (1 + 3i) =\]
\[= 3 + 4i - 1 - 3i = 2 + i;\]
\[2)\ (2 - 7i) - (5 + 2i) =\]
\[= 2 - 7i - 5 - 2i = - 3 - 9i;\]
\[3)\ (1 + i) - (1 - i) =\]
\[= 1 + i - 1 + i = 2i;\]
\[4)\ (5 - 2i) - (3 - 2i) =\]
\[= 5 - 2i - 3 + 2i = 2;\]
\[5)\ (2 + 5i) - ( - 1 + 6i) =\]
\[= 2 + 5i + 1 - 6i = 3 - i;\]
\[6)\ ( - 1 - 4i) - ( - 1 - 3i) =\]
\[= - 1 - 4i + 1 + 3i = - i;\]
\[7)\ \left( \sqrt{2} + 2\sqrt{3}i \right) - \left( 3\sqrt{2} - \sqrt{3}i \right) =\]
\[= \sqrt{2} + 2\sqrt{3}i - 3\sqrt{2} + \sqrt{3}i =\]
\[= - 2\sqrt{2} + 3\sqrt{3}i;\]
\[8)\ \left( 3\sqrt{5} - \sqrt{3}i \right) - \left( \sqrt{5} + 4\sqrt{3}i \right) =\]
\[= 3\sqrt{5} - \sqrt{3}i - \sqrt{5} - 4\sqrt{3}i =\]
\[= 2\sqrt{5} - 5\sqrt{3}i.\]