10201 nha bn

\(\frac{27}{31}=\frac{2727}{3131}=\frac{272727}{313131}\)

\(\frac{27}{31}=\frac{27\cdot101}{31\cdot101}=\frac{27\cdot10101}{31\cdot10101}\)

\(\Rightarrow\frac{27}{31}=\frac{2727}{3131}=\frac{272727}{313131}\)