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18 - (7 + 6 -
4 + (12 - 5+
20 - (17 - 8 -
c​


Răspuns :

Răspuns:

18-(7+6-4)+(12-5+20)-(17-8-c)=

18-9+27-(9-c)=

9+27-(9-c)=

36-(9-c)