Question

Вычислил 5/6-4/9:16/21

Answer 1

Ответ:

5/6-4/9•20/16=5/6-1/9•20/4=5/6-1/9•5=5/6-5/9=5/18

Answer 2

$\dfrac{5}{6} - \dfrac{4}{9}:\dfrac{16}{21} = \dfrac{5}{6} - \dfrac{4}{9}\cdot\dfrac{21}{16} = \dfrac{5}{6} - \dfrac{1}{9}\cdot\dfrac{21}{4} = \dfrac{5}{6} - \dfrac{21}{36} = \dfrac{5\cdot6}{36} - \dfrac{21}{36} = \dfrac{30-21}{36} = \dfrac{9}{36} = \dfrac{1}{4}$