1. Найдите значение выражения: 1) 26,98 + 3,5; 2) 17,4 − 12,58; 3) 8,04 · 6,7; 4) 7,38 : 8,2; 5) 3/4 + 5/16; 6) 4 5/6 − 1 3/8; 7) 12/45 · 27/42; 8) 2 1/2 : 1 2/3.

1. \(26.98+3.5=30.48\).
2. \(17.4-12.58=4.82\).
3. \(8.04\cdot6.7=53.868\).
4. \(7.38:8.2=0.9\).
5. \[\frac{3}{4}+\frac{5}{16}=\frac{12}{16}+\frac{5}{16}=\frac{17}{16}=1\frac{1}{16}.\]
6. \[4\frac{5}{6}-1\frac{3}{8}=\frac{29}{6}-\frac{11}{8}=\frac{116}{24}-\frac{33}{24}=\frac{83}{24}=3\frac{11}{24}.\]
7. \[\frac{12}{45}\cdot\frac{27}{42}=\frac{4}{15}\cdot\frac{9}{14}=\frac{6}{35}.\]
8. \[2\frac{1}{2}:1\frac{2}{3}=\frac{5}{2}:\frac{5}{3}=\frac{5}{2}\cdot\frac{3}{5}=\frac{3}{2}=1\frac{1}{2}.\]

Ответ: 1) 30,48; 2) 4,82; 3) 53,868; 4) 0,9; 5) 1 1/16; 6) 3 11/24; 7) 6/35; 8) 1 1/2.