Question

очень срочно надо решить

Answer 1

$\frac{3}{5} \times \frac{7}{9} - \frac{3}{5} ( \frac{7}{9} - \frac{5}{6} ) = \frac{3}{5} \times ( \frac{7}{9} - ( \frac{7}{9} - \frac{5}{6} ) = \\ = \frac{3}{5} \times ( \frac{7}{9} - \frac{7}{9} + \frac{5}{6} ) = \frac{3}{5} \times \frac{5}{6} = \frac{3}{6} = \frac{1}{2} = 0.5$