Question

Решите пожалуйста примеры.

Answer 1

25.
$( - \frac{17}{14} - \frac{8}{21} + \frac{1}{6} ) \times \frac{7}{10} + \frac{3}{10} = ( - \frac{ 51}{42} - \frac{16}{42} + \frac{7}{42} ) \times \frac{7}{10} + \frac{3}{10} = - \frac{60}{42} \times \frac{7}{10} + \frac{3}{10} = - 1 + 0.3 = - 0.7$
26.
$= \frac{1}{10} + \frac{19}{10} \times ( \frac{4}{5} - \frac{2}{3} - \frac{13}{12} ) = \frac{1}{10} + \frac{19}{10} \times ( \frac{48}{60} - \frac{40}{60} - \frac{65}{60} ) = \frac{1}{10} + \frac{19}{10} \times ( - \frac{57}{60} ) = \frac{1}{10} + \frac{19}{10} \times ( - \frac{19}{20} ) = \frac{1}{10} - \frac{361}{200} = \frac{20 - 361}{200} = - \frac{341}{200}$
27.
$= \frac{(0.1 - 0.5)(0.1 + 0.5)}{0.4(0.12 +0.88)} = \frac{ - 0.4 \times 0.6}{0.4 \times 1} = - 0.6$