a+b+c/3=2,26
a+2,28=c=>a=c-2,28
b+3,66=c=>b=c-3,66
inlocuim
c-2,28+c-3,66+c/3=2,26
3c-5,94=2,26x3
3c=6,78+5,94
3c=12,72
c=12,72/3
c=4,24 al treilea nr
a=4,24-2,28=>a=1,96 primul nr
b=4,24-3,66=>b=0,58 al doilea nr
verificare
1,96+0,58+4,24/3=6,78/3=2.,26media aritmetica
