Ответ:
- \(\frac{2}{9}+\frac{5}{9}=\frac{7}{9}\).
- \(\frac{17}{26}-\frac{12}{26}=\frac{5}{26}\).
- \(11\frac{2}{5}-3\frac{1}{5}=8\frac{1}{5}\).
- \(3\frac{2}{7}+2\frac{5}{7}=5+\frac{7}{7}=6\).
- \(3-1\frac{2}{3}=1\frac{1}{3}\).
- \(1\frac{4}{7}+2\frac{3}{21}=1\frac{4}{7}+2\frac{1}{7}=3\frac{5}{7}\).
- \(5\frac{1}{4}+3\frac{8}{11}=8+\frac{11}{44}+\frac{32}{44}=8\frac{43}{44}\).
- \(5\frac{1}{4}-3\frac{7}{8}=\frac{21}{4}-\frac{31}{8}=\frac{42-31}{8}=1\frac{3}{8}\).
- \(\left(3\frac{1}{4}-2\frac{2}{3}\right)\left(1\frac{5}{6}-\frac{7}{12}\right)+3\frac{5}{24}=\left(\frac{13}{4}-\frac{8}{3}\right)\left(\frac{11}{6}-\frac{7}{12}\right)+3\frac{5}{24}=\frac{7}{12}\cdot\frac{5}{4}+3\frac{5}{24}=\frac{35}{48}+3\frac{10}{48}=3\frac{15}{16}\).
Ответ: 1) \(\frac{7}{9}\); 2) \(\frac{5}{26}\); 3) \(8\frac{1}{5}\); 4) \(6\); 5) \(1\frac{1}{3}\); 6) \(3\frac{5}{7}\); 7) \(8\frac{43}{44}\); 8) \(1\frac{3}{8}\); 9) \(3\frac{15}{16}\).
