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Calculati
1+{2+[3•(4+5)-6+7•8]-9}=
Va rog !


Răspuns :

1+{2+[3*(4+5)-6+7*8]-9}=
=1+[2+(3*9-6+56)-9]
=1+(2+27-6+56-9)
=1+70
=71