Вариант 1. 2. Выполните действия: (−5/12 + 11/16) : (−13/72); (7/16 − 31/40) : (−17/24 + 27/40).

1. \(\left(-\frac5{12}+\frac{11}{16}\right):\left(-\frac{13}{72}\right)=\left(-\frac{20}{48}+\frac{33}{48}\right)\cdot\left(-\frac{72}{13}\right)=\frac{13}{48}\cdot\left(-\frac{72}{13}\right)=-\frac32\).
2. \(\left(\frac7{16}-\frac{31}{40}\right):\left(-\frac{17}{24}+\frac{27}{40}\right)=\left(\frac{35}{80}-\frac{62}{80}\right):\left(-\frac{85}{120}+\frac{81}{120}\right)=\left(-\frac{27}{80}\right):\left(-\frac1{30}\right)=\frac{81}{8}=10\frac18\).

Ответ: −3/2; 81/8.