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9×(101×1+111:1)-[85-7×(36:9+63:9)]

Răspuns :

9×(101×1+111:1)-[85-7×(36:9+63:9)] = 
9x(101+111)-[85+7x(4+7)]=
9x212-(85+7x7)=
1908-(85+49)=
1908-134=
1774