[tex] - 2.1(6) = - 2 \frac{16 - 1}{90} = - 2 \frac{15}{90} = - 2 \frac{1}{6} = - \frac{2 \times 6 + 1}{6} = - \frac{13}{6} [/tex]
[tex]sau[/tex]
[tex] - 2.1(6) = - \frac{216 - 21}{90} = - \frac{195}{90} = - \frac{39}{18} = - \frac{13}{6} [/tex]
[tex]0.(6) = \frac{6}{9} = \frac{2}{3} [/tex]
[tex]1.2 = \frac{12}{10} = \frac{6}{5} [/tex]
[tex] - 0.(36) = - \frac{36}{99} = - \frac{12}{33} = - \frac{4}{11} [/tex]
