Giải thích các bước giải:
$\begin{array}{l} b)\,25.{( - \frac{1}{5})^3} + \frac{1}{5} - 2.{(\frac{{ - 1}}{2})^2} - \frac{1}{2}\\ = - {5^2}.\frac{1}{{{5^3}}} + \frac{1}{5} - 2.\frac{1}{{{2^2}}} - \frac{1}{2}\\ = - \frac{{{5^2}}}{{{5^3}}} + \frac{1}{5} - \frac{2}{{{2^2}}} - \frac{1}{2}\\ = - \frac{1}{5} + \frac{1}{5} - \frac{1}{2} - \frac{1}{2}\\ = - 1\\ d)\,35\frac{1}{6}:( - \frac{4}{5}) - 45\frac{1}{6}:( - \frac{4}{5})\\ = (35\frac{1}{6} - 45\frac{1}{6}):( - \frac{4}{5})\\ = (35 + \frac{1}{6} - 45 - \frac{1}{6}):( - \frac{4}{5})\\ = - 10:( - \frac{4}{5})\\ = \frac{{25}}{2} \end{array}$
