a) Mulțimile sunt: A= {1,3,5,7}, B={2,4,5,7}, C={4,6,7,9}. b) Se obtine: A U B = {1,2,3,4,5,7}, A U C = {1,3,4,6,7,9}, B U C ={2,4,5,6,7,9}, A - B ={1,3}, A - C ={1,3,5}, B - C ={2,5}, A U B U C ={1,2,3,4,5,6,7,9},A n B n C = {7}, (A U C) - B={1,3,4,5,6,7,9} - {2,4,5,7} = {1,3,6,9} VA ROG MULT SA MA AJUTATI!!!​