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Răspuns:
Explicație pas cu pas:
a)
A={1,3,5,7} B={2,4,5,7} C={4,6,7,9}
b)
A∪B={1,2,3,4,5,7}
A∪C={1,3,4,5,6,7,9}
B∪C={2,4,5,6,7,9}
A-B={1,3}
A-C={1,3,5}
B-C={2,5}
A∪B∪C={1,2,3,4,5,6,7,9}
A∩B∩C={7}
(A∪C)-B={1,3,4,5,6,7,9} -{2,4,5,7}={1,3,6,9}