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21. Se dau mulţimile A = {x € N° | x + 3 < 9}, B = {xe N | 5 ≤x+ 20 a=72: (25-2 [5²-(3853): (37-5²)]}, b=(77: 74-7²)²: 7¹¹c (AnC)u(BC). [3¹4: (3¹)​