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[55x5- (199-99x2+20x5)+1220:4]=????????????????

Răspuns :

[55x5-(199-99x2+20x5)+1220:4]=(55x5-101+1220:4)=479

(199-99x2+20x5)=(199-198+100)=101
(55x5-101+1220:4)=(275-101+305)=174+305=479
[275-(199-198+100)+305]=
=[275-(1+100)+305]=
=(275-101+305)=
=174+305=
=479