[tex]\it a)\ \ \overline{8a5}\ \vdots\ 9 \Rightarrow a=5 \Rightarrow \dfrac{x}{9}=\dfrac{\ 19^{(19}}{855} \Rightarrow \dfrac{x}{9}=\dfrac{1}{45} \Rightarrow x=\dfrac{\ 9^{(9}}{45}=\dfrac{1}{5}=\dfrac{2}{10}=0,2\\ \\ \\ f)\ \ \overline{18a}\ \vdots\ 13 \Rightarrow a=2 \Rightarrow \dfrac{x}{14}=\dfrac{\ \ 26^{(26}}{182} \Rightarrow \dfrac{x}{14}=\dfrac{1}{7} \Rightarrow x=\dfrac{14}{7}=2[/tex]
