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.
$= frac{(0.1 - 0.5)(0.1 + 0.5)}{0.4(0.12 +0.88)} = frac{ - 0.4 times 0.6}{0.4 times 1} = - 0.6$