2. \( -\frac{2}{5}\left(\frac{15}{20}-\frac{8}{10}\right)-\left[\frac{9}{2}+5\left(\frac{2}{8}-\frac{2}{4}\right)\right] \) 3. \( \frac{5}{4}\left(\frac{5}{2}-\frac{7}{10}\right)+\left[\frac{1}{2}+2\left(\frac{1}{8}-\frac{1}{4}\right)\right] \)

83 Найдите произведение: \( \begin{array}{l}\text { а) } \frac{4}{9} \cdot \frac{9}{7} \cdot \frac{7}{17} \cdot \frac{17}{28} ;\end{array} \)

3. (a5-g18-14) Ko'p qavatli uyning 4 - qavatigacha bo'lgan masofa 12 metr. Shu uyning 12 -qavatigacha bo'lgan masofa necha metr? \( \begin{array}{llll}\text { A) } 48 & \text { B) } 44 & \text { C) } 36 & \text { D) } 33\end{array} \)

c) \( \frac{5}{6}-\frac{7}{8}+\frac{11}{12} \)

e) \( 1 \frac{1}{3}+2 \frac{1}{4}-3 \frac{5}{12} \)

4. (a5-g13-12) Tashkilotdagi ishchilaming \( 2 / 3 \) qismi ayollar. Erkak ishchilaming 315 qismi oilali va 12 nafari uylanmagan bolla, tashkilotda nechta ishchi ishlamoqda? \( \begin{array}{llll}\text { A) } 90 & \text { B) } 72 & \text { C) } 60 & \text { D) } 50\end{array} \)