Zad. 2.7
[tex]1.8 - \frac{9}{5} + \frac{2}{5} \times 0.375 \div 5 = \frac{18}{10} - \frac{18}{10} + \frac{4}{10} \times 0.375 \div 5 = \frac{4}{10} \times 0.075 = 0.4 \times .075 = 0.1875[/tex]
Zad. 2.9
[tex] \frac{8}{3} + \frac{45}{10} \times \frac{51}{10} - \frac{39}{10} = \frac{8}{3} + \frac{9}{10} \times \frac{51}{2} - \frac{39}{10} = \frac{8}{3} + \frac{459}{20} - \frac{39}{10} = \frac{160}{60} + \frac{13770}{60} - \frac{160}{60} = \frac{13930}{60} - \frac{160}{60} = \frac{13770}{60} = 229.5[/tex]
