Tính hợp lí (nếu có thể):

i) \(\frac{{ - {2^3}}}{9} + \frac{4}{9}\left[ { - \left( {2012\frac{2}{7} - 2012\frac{2}{7}} \right):\left| { - \frac{1}{{21}}} \right|} \right]\);

d) \(\frac{{2\,.\,{6^9} - {2^5}\,.\,{{18}^4}}}{{{2^2}\,.\,{6^8}}}\)

\[ = \frac{{2\,.\,{{\left( {2\,.\,3} \right)}^9} - {2^5}\,.\,{{\left( {2\,.\,{3^2}} \right)}^4}}}{{{2^2}\,.\,{{\left( {2\,.\,3} \right)}^8}}}\]

\[ = \frac{{2\,.\,{2^9}\,.\,{3^9} - {2^5}\,.\,{2^4}\,.\,{3^8}}}{{{2^2}\,.\,{2^8}\,.\,{3^8}}}\]

g) \(\frac{{15}}{{34}} + \frac{7}{{21}} + \frac{{19}}{{34}} - \frac{{20}}{{15}} + \frac{3}{7}\)

\( = {\rm{\;}}\left( {\frac{{15}}{{34}} + \frac{{19}}{{34}}} \right) + \left( {\frac{1}{3} - \frac{4}{3}} \right) + \frac{3}{7}\)