1.A={0,3,5,6,9}{\displaystyle A=\{0,3,5,{6,9\}}} B={2,3,9}{\displaystyle B=\{2,3,9\}} C={0,2,3,6}{\displaystyle C=\{0,2,3,6\}} . Знайти
2.A={1,2,3,4,5}{\displaystyle A=\{1,2,3,4,5\}} B={3,4,5,6,7}{\displaystyle B=\{3,4,5,6,7\}} C={2,4,6,8,10}{\displaystyle C=\{2,4,6,8,10\}} . Знайти