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) 6 7/12 − 5 11/15; 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. \(\frac34+\frac5{16}=\frac{12}{16}+\frac5{16}=\frac{17}{16}=1\frac1{16}\).
6. \(6\frac7{12}-5\frac{11}{15}=6\frac{35}{60}-5\frac{44}{60}=\frac{51}{60}=\frac{17}{20}\).
7. \(\frac{12}{45}\cdot\frac{27}{42}=\frac4{15}\cdot\frac9{14}=\frac6{35}\).
8. \(2\frac12:1\frac23=\frac52:\frac53=\frac52\cdot\frac35=\frac32=1\frac12\).

Ответ: 1) 30,48; 2) 4,82; 3) 53,868; 4) 0,9; 5) 1 1/16; 6) 17/20; 7) 6/35; 8) 1 1/2.