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Dutudutu2005
a fost răspuns

Calculati D6 reunit D8 si M2 intersectat M12

Răspuns :

D6={1, 2, 3, 6}       D8={1, 2, 4, 8}  
D6 ∪ D8={1, 2, 3, 4, 6, 8}

M2={0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, ..............2·n}
M12={0, 12, 24, 36, ..............12·n }   
M2 ∩ M12={0, 12, 24 , 36, .............12·n      Sunt multimi infinite.