[tex](0.(4) - 0.4) \div 2 \times 4.5 \\ \\ ( \frac{4}{9} - \frac{4}{10} ) \div 9 \\ \\ ( \frac{40}{90} - \frac{36}{90} ) \times \frac{1}{9} \\ \\ \frac{4}{90} \times \frac{1}{9} = \frac{4}{810} = \frac{2}{405} [/tex]
