Question

(1/2,5-1 - 1/6:-1) : 4/45

Answer 1

Ответ:

$( \frac{1}{2.5 - 1} - \frac{1}{3 \frac{1}{2} \div ( - 1)} ) \div \frac{4}{15} = \\ ( \frac{1}{1.5} - \frac{1}{ \frac{7}{ - 2} } ) \div \frac{4}{15} = \\ ( \frac{2}{3} + \frac{2}{7} ) \div \frac{4}{15} = \\ \frac{14 + 6}{21} \div \frac{4}{15} = \\ \frac{20 \times 15}{21 \times 4} = \\ \frac{25}{7} = 3 \frac{4}{7}$