a+b=13 b+c=7 c+a=10
a,b,c?
URGENT

Răspuns:
a+b + b+c+ c+a=13+7+10
2a+2b+2c=30
a+b+c=30:2=15
c= 15-13=2
b= 15-10=5
a= 15-7=8