Вычисли выражения с дробями: 1) 6/5 - 9/14

Конечно, вот решение: 1) $\frac{6}{5} - \frac{9}{14} = \frac{6 \cdot 14 - 9 \cdot 5}{5 \cdot 14} = \frac{84 - 45}{70} = \frac{39}{70}$ 2) $\frac{5}{18} + \frac{7}{30} = \frac{5 \cdot 30 + 7 \cdot 18}{18 \cdot 30} = \frac{150 + 126}{540} = \frac{276}{540} = \frac{23}{45}$ 3) $\frac{5}{9} - \frac{3}{8} = \frac{5 \cdot 8 - 3 \cdot 9}{9 \cdot 8} = \frac{40 - 27}{72} = \frac{13}{72}$ 4) $\frac{17}{28} - \frac{4}{45} = \frac{17 \cdot 45 - 4 \cdot 28}{28 \cdot 45} = \frac{765 - 112}{1260} = \frac{653}{1260}$ 5) $0{,}6 + \frac{4}{9} = \frac{6}{10} + \frac{4}{9} = \frac{3}{5} + \frac{4}{9} = \frac{3 \cdot 9 + 4 \cdot 5}{5 \cdot 9} = \frac{27 + 20}{45} = \frac{47}{45} = 1\frac{2}{45}$ 6) $\frac{4}{5} - 0{,}37 = \frac{4}{5} - \frac{37}{100} = \frac{4 \cdot 100 - 37 \cdot 5}{5 \cdot 100} = \frac{400 - 185}{500} = \frac{215}{500} = \frac{43}{100} = 0{,}43$