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[(512:4-13×9+42:21)]×[220+(224:7-6×5)]:6=

Răspuns :

[(512:4-13*9+42:21)]*[220+(224:7-6*5)]:6=
(128-117+2)*[220+(32-30)]:6=
13*(220+2):6=13*222:6
2886:6=481