Question

X, 7 (bară sus)+x, 4 (bară sus)=11, 1

Answer 1

 $\overline{x,7}=\frac{\overline{x7}}{10}=\frac{10x+7}{10}\;\;...\;aseman\u{a}tor\;...\;\;\overline{x,4}=\frac{10x+4}{10}$
[tex]\frac{10x+7}{10}+\frac{10x+4}{10}=\frac{111}{10}\;\leftrightarrow\;10x+7+10x+4=111\;adic\u{a}:\;\\ 20x\,=\,111-11\;\;\rightarrow\;\;20x=100\;\;deci\;\;\fbox{x=5}[/tex]