C.C. 2012 – 3409

Se

allora @ è uguale a:

  1. -8
  2. -6
  3. -4
  4. 6

Soluzione: -8


Osserva

©-1+@ = §-6
con ©=3+§
3+§-1+@ = §-6
2+@ = -6
@ = -8
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