[tex] \frac{11 - 1}{9} + \frac{22 - 2}{9} = \frac{10}{9} + \frac{20}{9} = \frac{30}{9} [/tex]
[tex]5.(5) = \frac{55 - 5}{9} = \frac{50}{9} [/tex]
[tex] \frac{a}{b} = \frac{ \frac{30}{9} }{ \frac{50}{9} } = \frac{30}{9} \times \frac{9}{50} = \frac{30 \times 9}{50 \times 9} = \frac{3}{5} [/tex]
