\(\overline{abc,de1}=0,3x\overline{1abc,de}\)
\(\Rightarrow\overline{abc,de1}=\frac{3x\overline{1abc,de}}{10}\Rightarrow\overline{abcd,e1}=3x\overline{1abc,de}\)
\(\Rightarrow\overline{abcde1}=3x\overline{1abcde}\)
\(\Rightarrow10x\overline{abcde}+1=300000+3x\overline{abcde}\)
\(\Rightarrow7x\overline{abcde}=299999\Rightarrow\overline{abcde}=42857\)
\(\Rightarrow\overline{abc,de1}=428,571\)