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calculati suma a+b+c, stiind ca a,b,c sunt cifrele sunt si ca a,b+ b,c+c,a=77/5

Răspuns :

[tex]\overline{a,b}+\overline{b,c}+\overline{a,c}=\frac{77}{5}\\ \frac{\overline{ab}}{10}+\frac{\overline{bc}}{10}+\frac{\overline{ac}}{10}=\frac{77}{5}|*10\\ \overline{ab}+\overline{bc}+\overline{ac}=154\\ 10a+b+10b+c+10a+c=154\\ 11a+11b+11c=154\\ 11(a+b+c)=154\\ \boxed{a+b+c=14}[/tex]

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