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stiind ca a+b=12,b+c=45 si c+a=251,calculati (a+b+c):2.DAU COROANA (ITS NOT FAKE)​

Răspuns :

Răspuns:

2a+2b+2c = 251+12+45

2(a+b+c)=308/:2

a+b+c= 154 rezulta ca (a+b+c) :2=154:2=177