Question

Запишите решение и ответ. Даю 30 баллов..

Answer 1

$4\div\dfrac{16}{19}+3\dfrac{3}{5}\cdot\bigg(\dfrac{5}{12}-3\dfrac{13}{24}\bigg)=\bold{-6,5}$

$1) \: \: \dfrac{5}{12}-3\dfrac{13}{24}=\dfrac{10}{24}-\dfrac{85}{24}=-\dfrac{75}{24}=-\dfrac{25}{8}$

$2) \: \: 4\div\dfrac{16}{19}=4\cdot\dfrac{19}{16}=\dfrac{19}{4}$

$3) \: \: 3\dfrac{3}{5}\cdot\bigg(-\dfrac{25}{8}\bigg)=\dfrac{18}{5}\cdot\bigg(-\dfrac{25}{8}\bigg)=\dfrac{9}{1}\cdot\bigg(-\dfrac{5}{4}\bigg)=-\dfrac{45}{4}$

$4) \: \: \dfrac{19}{4}-\dfrac{45}{4}=-\dfrac{26}{4}=-\dfrac{13}{2}=-6,5$