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fie multimile : A={1;2;3;5}, B={0;2:4;6}si C={1;3;6;7;8;9} calculeaza: A U B; B U A; A U intorsB ( A U B) U C ; A U (B U C); B U întors A; A/B B/A ( A/B)/C; A/(B/C). dau coroana ​