199. Найдите значение выражения: 1) (−5/12 + 11/16) : (−13/72); 2) (9/14 − (−5/21)) : (−2 9/14); 3) (7/16 − 31/40) : (−17/24 + 27/40); 4) −3 3/4 − (−8 2/9 − (−4,5) : 9/14) · 2 1/4.

1. \(\left(-\frac{5}{12}+\frac{11}{16}\right):\left(-\frac{13}{72}\right)=\frac{13}{48}\cdot\left(-\frac{72}{13}\right)=-\frac32\).
2. \(\left(\frac9{14}-\left(-\frac5{21}\right)\right):\left(-2\frac9{14}\right)=\frac{37}{42}:\left(-\frac{37}{14}\right)=-\frac13\).
3. \(\left(\frac7{16}-\frac{31}{40}\right):\left(-\frac{17}{24}+\frac{27}{40}\right)=-\frac{27}{80}:\frac{13}{120}=-\frac{81}{26}\).
4. \(-3\frac34-\left(-8\frac29-(-4.5):\frac9{14}\right)\cdot2\frac14=-\frac{15}{4}-\left(-\frac{74}{9}+7\right)\cdot\frac94=-\frac{15}{4}+\frac94\cdot\frac{11}{9}= -\frac32\).

Ответ: 1) \(-\frac32\); 2) \(-\frac13\); 3) \(-\frac{81}{26}\); 4) \(-\frac32\).