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Daca a+b=60,b+c=78,c+a=306,calculeaza(a+b+c):3

Răspuns :

a + b = 60
b + c = 78
c + a = 306
adunam cele 3 relatii
2 × a + 2 × b + 2 × c = 60 + 78 + 306
2 × (a + b + c) = 444
a + b + c = 444 : 2 = 222

(a + b + c ) : 3 = 222 : 3 = 74