1. (1 задание ВПР7) Найти значение выражения: 7/8 − 5/6 − 9/20; 2/9 + 4/7 · 9/28; 4 1/6 : 5/2 + 1/3; 1 − 4/5 · 2 2/9; 22/3 : 11/48 · 5/8; 2,64 : 2,2 − 0,5; −4,9 + 4,81 : 1,3; (2,6 − 8,4) / 2,5.

1. \(\frac{7}{8}-\frac{5}{6}-\frac{9}{20}=\frac{105-100-54}{120}=-\frac{49}{120}\).
2. \(\frac{2}{9}+\frac{4}{7}\cdot\frac{9}{28}=\frac{2}{9}+\frac{9}{49}=\frac{98+81}{441}=\frac{179}{441}\).
3. \(4\frac{1}{6}:\frac{5}{2}+\frac{1}{3}=\frac{25}{6}\cdot\frac{2}{5}+\frac{1}{3}=\frac{5}{3}+\frac{1}{3}=2\).
4. \(1-\frac{4}{5}\cdot2\frac{2}{9}=1-\frac{4}{5}\cdot\frac{20}{9}=1-\frac{16}{9}=-\frac{7}{9}\).
5. \(\frac{22}{3}:\frac{11}{48}\cdot\frac{5}{8}=\frac{22}{3}\cdot\frac{48}{11}\cdot\frac{5}{8}=\frac{20}{3}\).
6. \(2,64:2,2-0,5=1,2-0,5=0,7\).
7. \(-4,9+4,81:1,3=-4,9+3,7=-1,2\).
8. \((2,6-8,4):2,5=-5,8:2,5=-2,32\).

Ответ: −49/120; 179/441; 2; −7/9; 20/3; 0,7; −1,2; −2,32.