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(65·602:10-c-63):3=600



Răspuns :

(3 913-c-63)÷3=600
Facem mersul invers
3 913-c-63 = 600×3
3 913-c-63=1 800
c-63=3 913-1 800
c-63=2 113
c=2 113+63
c=2 176

Cred ca este bine.
Coroana...!?