№1. Вычислите: 1. (3,9 − 2,4) · 8,2. 2. (9,5 + 8,9) : 2,3. 3. 2,4 + 1,56 : 1,3. 4. 2/5 + 1/4 + 2. 5. 29/7 : (2/7 + 3/4). 6. (11/12 + 11/20) · 15/8. 7. 18/4 : 14/3 : 4/5. 8. 4 4/9 : 4/9.

1. \( (3.9-2.4)\cdot 8.2=1.5\cdot 8.2=12.3 \).
2. \( (9.5+8.9):2.3=18.4:2.3=8 \).
3. \( 2.4+1.56:1.3=2.4+1.2=3.6 \).
4. \( \frac{2}{5}+\frac{1}{4}+2=\frac{8}{20}+\frac{5}{20}+\frac{40}{20}=\frac{53}{20}=2.65 \).
5. \( \frac{29}{7}:\left(\frac{2}{7}+\frac{3}{4}\right)=\frac{29}{7}:\frac{29}{28}=4 \).
6. \( \left(\frac{11}{12}+\frac{11}{20}\right)\cdot\frac{15}{8}=\left(\frac{55}{60}+\frac{33}{60}\right)\cdot\frac{15}{8}=\frac{22}{15}\cdot\frac{15}{8}=\frac{11}{4}=2.75 \).
7. \( \frac{18}{4}:\frac{14}{3}:\frac{4}{5}=\frac{9}{2}\cdot\frac{3}{14}\cdot\frac{5}{4}=\frac{135}{112} \).
8. \( 4\frac{4}{9}:\frac{4}{9}=\frac{40}{9}\cdot\frac{9}{4}=10 \).

Ответ: 1) 12,3; 2) 8; 3) 3,6; 4) 2,65; 5) 4; 6) 2,75; 7) 135/112; 8) 10.