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Calculați: a) 375+{145+[3482-(125+342)] -15}; b) (1453-286)+[3457-(149+324)]; c) 21+{145+[3115-(1149-283)+17]}; d) [(2456-1563)+203]-154; e) 2+{154+[325-(164+75-138)]-29}; f) (1111-812)+[345-(145+79)]-205;​