Sendo A = {3, 4, 5, 6, 7} e B = {5, 6, 7, 8, 9}, determine A Ç B

Para esse exercício, realizaremos os procedimentos abaixo:

\(\begin{array}{l} {\bf{A}}{\rm{ }} = {\rm{ }}\{ {\bf{3}},{\bf{4}},{\bf{5}},{\bf{6}},{\bf{7}}\} \\ {\bf{B}}{\rm{ }} = {\rm{ }}\{ {\bf{5}},{\bf{6}},{\bf{7}},{\bf{8}},{\bf{9}}\} \\ {\bf{A}} - {\bf{B}}{\rm{ }} = {\rm{ }}\{ {\bf{3}},{\bf{4}}\} \\ {\bf{B}} - {\bf{A}}{\rm{ }} = {\rm{ }}\{ {\bf{8}},{\bf{9}}\} \\ \left[ {{\bf{AUB}}} \right]{\rm{ }} - {\rm{ }}\left[ {{\bf{AinterB}}} \right]{\rm{ }} = {\rm{ }}\left\{ {{\bf{3}},{\bf{4}},{\bf{5}},{\bf{6}},{\bf{7}},{\bf{8}},{\bf{9}}} \right\}{\rm{ }} - {\rm{ }}\left\{ {{\bf{5}},{\bf{6}},{\bf{7}}} \right\}{\rm{ }}\\ \left[ {{\bf{AUB}}} \right]{\rm{ }} - {\rm{ }}\left[ {{\bf{AinterB}}} \right] = {\rm{ }}\left\{ {{\bf{3}},{\bf{4}},{\bf{8}},{\bf{9}}} \right\}\; \end{array}\)