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406-4*3[3*(30-18:6:3)]=

Răspuns :

406-4*3[3*(30-3:3)]=
406-4*3[3*(30-1)]=
406-4*3(3*29)=
406-4*3*87=
406-4*261=
406-1044=
-638
Asta daca enuntul exercitiului este scris corect

406-4*3[3*(30-18:2)]

406-4*3[3*(30-9)]

406-4*3(3*21)

406-4*3*63

406-12*63

406-432

-26