Question

срочно пожалуйста!!!​

Answer 1

Ответ:

а)

$\frac{2}{3} \div ( \frac{3}{4} - \frac{5}{12} ) = \\ 1) \frac{3}{4} - \frac{5}{12} = \frac{9}{12} - \frac{5}{12} = \frac{4}{12} = \frac{1}{3} \\ 2) = \frac{2}{3} \div \frac{1}{3} = \frac{2}{3} \times 3 = 2$

б)

$3 - \frac{2}{3} \times \frac{6}{7} = \\ 1)- \frac{2}{3} \times \frac{6}{7} = - 2 \times \frac{2}{7} = - \frac{4}{7} \\ 2)3 - \frac{4}{7} = \frac{21}{7} - \frac{4}{7} = \frac{17}{7} = 2 \frac{3}{7}$