\[1)\ (5 - 3i) - (1 + 2i) + (2 - i) =\]
\[= 5 - 3i - 1 - 2i + 2 - i =\]
\[= 6 - 6i;\]
\[2)\ (4 - 2i) - (7 + i) + (2 - i) =\]
\[= 4 - 2i - 7 - i + 2 - i =\]
\[= - 1 - 4i;\]
\[3)\ (8 + 2i) - (3 - 7i) - (5 + 6i) =\]
\[= 8 + 2i - 3 + 7i - 5 - 6i = 3i;\]
\[4)\ (2 + 3i) + ( - 6 - i) - ( - 3 + 2i) =\]
\[= 2 + 3i - 6 - i + 3 - 2i = - 1.\]