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804-4x{502-[58+4x (31x9-234÷3)]÷2}=

Răspuns :

804-4·{502-[58+4·(31·9-234:3)]:2}=
= 804-4·{502-[58+4·(279-78)]:2}=
= 804-4·[502-(58+4·201):2]=
= 804-4·[502-(58+804):2]=
= 804-4·(502-862:2)=
= 804-4·(502-431)=
= 804-4·71=
= 804 - 284 = 520.

/robertinni