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efectuati
13-3*[7-2*(5-3)]
(2*8)*(2*9)-2*(8*9)


Răspuns :

13-3*[7-2*(5-3)]=13-3*(7-2*2)=13-3*3=13-9=4


(2*8)*(2*9)-2*(8*9) =16*18-2*72=288-144=144