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a+b=20
b+c=18
c+a=22
Aflati numerele a,b,c


Răspuns :

adunam cele trei ecuatii
a+b+b+c+c+a=20+18+22
2a+2b+2c=60
2(a+b+c)=60 |:2
a+b+c= 30
a+b=20
c = 30-20= 10
b+c=18
a=30-18 =12
c+a = 22
b =30-22= 8
numerele sunt: 12;8;10