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17-[2-(-6+15)] /// 47+[-14+(17-53)] /// -37+{-3+[5+(-21-54)]} /// -23+{-19-[-33+37-(-29)]}

Răspuns :

CosmoteRo
17-(2+9)=17-11=6

47+(-14-18)=47-32=15

-37+(-3+(5-75))=-37+(-3-70)=-37-73=-110

-23+(-19-33)=-23-52=-75