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3•{2+740:[77-20•(998-249•4)]}-13•5

Răspuns :

=3·{2+740:[77-20·(998-996)]}-65=3·[2+740:(77-20·2)]-65=3·[2+740:(77-40)]-65=3·(2+740:37)-65=3·(2+20)-65=3·22-65=66-65=1