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{[14×6-(144:2-720÷10)]×5}×2

Răspuns :

{[84-(72-72)]x5}x2
(84x5)x2= 420x2=840

{[14×6-(144:2-720:10)]×5 }×2
[(14×6-0)×5]×2
(84×5)×2
420:2=210