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  • Utilizator Brainly
2014-11-09T11:00:43+02:00

a+b+c=80


(a+b):2=12
a+b=12*2
a+b=24

(b+c):2=36
b+c=36*2
b+c=72

24+c=80
c=56

a+72=80
a=8

8+b=24
b=16
40 4 40