Đáp án:
$\begin{array}{l}
d)\dfrac{{ - 16}}{{42}} - \dfrac{5}{8} = \dfrac{{ - 8}}{{21}} - \dfrac{5}{8} = \dfrac{{ - 8.8 - 5.21}}{{168}} = \dfrac{{ - 169}}{{168}}\\
e) - 1\dfrac{1}{9} - \left( { - \dfrac{5}{{12}}} \right) = \dfrac{{ - 10}}{9} + \dfrac{5}{{12}}\\
= \dfrac{{ - 10.4 + 5.3}}{{36}} = \dfrac{{ - 25}}{{36}}\\
g)0,4 + \left( { - 2\dfrac{4}{5}} \right)\\
= \dfrac{2}{5} - \dfrac{{14}}{5}\\
= \dfrac{{ - 12}}{5}\\
h)0,75 - 2\dfrac{1}{3}\\
= \dfrac{3}{4} - \dfrac{7}{3}\\
= \dfrac{{3.3 - 7.4}}{{12}} = \dfrac{{ - 19}}{{12}}
\end{array}$
