Thực hiện phép tính

i) \(\frac{3}{5}:\left( {\frac{{ - 1}}{{15}} - \frac{1}{6}} \right) + \frac{3}{5}:\left( {\frac{{ - 1}}{3} - 1\frac{1}{{15}}} \right)\);

a) \(\frac{1}{9} - 0,3 \cdot \frac{5}{9} + \frac{1}{3} + 5\) 

\( = \frac{1}{9} - \frac{3}{{10}} \cdot \frac{5}{9} + \frac{1}{3} + 5\)

\( = \frac{1}{9} - \frac{1}{6} + \frac{1}{3} + 5\)

h) \(0,8:\left\{ {0,2 - 7\left[ {\frac{1}{6} + \left( {\frac{5}{{21}} - \frac{5}{{14}}} \right)} \right]} \right\}\)

\( = 0,8:\left\{ {0,2 - 7\left[ {\frac{1}{6} + \left( { - \frac{5}{{42}}} \right)} \right]} \right\}\)

\[ = 0,8:\left\{ {0,2 - 7\left[ {\frac{1}{{21}}} \right]} \right\}\]

\[ = \frac{4}{5}:\left\{ {\frac{1}{5} - \frac{1}{3}} \right\}\]