1. Найдите значение выражения: 1) 18,4 + 9,77; 2) 15,7 − 3,48; 3) 5,2 · 0,25; 4) 3,33 : 3,7; 5) \(\frac{2}{3}+\frac{5}{8}\); 6) \(8\frac{5}{12}-6\frac{7}{20}\); 7) \(\frac{5}{6}\cdot\frac{3}{20}\); 8) \(2\frac{5}{8}\cdot\frac{7}{32}\).

1. \(18,4+9,77=28,17\).
2. \(15,7-3,48=12,22\).
3. \(5,2\cdot0,25=1,3\).
4. \(3,33:3,7=0,9\).
5. \(\frac{2}{3}+\frac{5}{8}=\frac{16}{24}+\frac{15}{24}=\frac{31}{24}=1\frac{7}{24}\).
6. \(8\frac{5}{12}-6\frac{7}{20}=2+\frac{25}{60}-\frac{21}{60}=2\frac{1}{15}\).
7. \(\frac{5}{6}\cdot\frac{3}{20}=\frac{15}{120}=\frac{1}{8}\).
8. \(2\frac{5}{8}\cdot\frac{7}{32}=\frac{21}{8}\cdot\frac{7}{32}=\frac{147}{256}\).

Ответ: 1) 28,17; 2) 12,22; 3) 1,3; 4) 0,9; 5) \(1\frac{7}{24}\); 6) \(2\frac{1}{15}\); 7) \(\frac{1}{8}\); 8) \(\frac{147}{256}\).