[tex]1) \: 1.(5) + 1.4(8) = 1 \frac{5}{9} + 1 \frac{48 - 4}{90} = \frac{14}{9} + \frac{44 + 90}{90} = \frac{14}{9} + \frac{134}{90} = \frac{140 + 134}{90} = \frac{274}{90} = \frac{137}{45} \\ \\ 2) \: 3.(18) \div 0.7 = 3 \frac{18}{99} \div \frac{7}{10} = 3 \frac{2}{11} \times \frac{10}{7} = \frac{35}{11} \times \frac{10}{7} = \frac{350}{77} = \frac{50}{11} [/tex]
