Ответ:
- \(\frac{5}{26}+\frac{11}{26}-\frac{7}{26}=\frac{5+11-7}{26}=\frac{9}{26}\).
- \(5\frac{8}{21}-2\frac{3}{21}+1\frac{5}{21}=\frac{113}{21}-\frac{45}{21}+\frac{26}{21}=\frac{94}{21}=4\frac{10}{21}\).
- \(1-\frac{15}{17}=\frac{17}{17}-\frac{15}{17}=\frac{2}{17}\).
- \(4\frac{1}{6}:\frac{5}{12}=\frac{25}{6}\cdot\frac{12}{5}=10\).
Ответ: 1) \(\frac{9}{26}\); 2) \(4\frac{10}{21}\); 3) \(\frac{2}{17}\); 4) \(10\).
