\(\overline{abcdeg}=1000x\overline{abc}+\overline{deg}=999x\overline{abc}+\left(\overline{abc}+\overline{deg}\right)=27.37.\overline{abc}+\left(\overline{abc}+\overline{deg}\right)\)
\(27.39.\overline{abc}⋮37;\overline{abc}+\overline{deg}⋮37\Rightarrow\overline{abcdeg}⋮37\)