Ответ:
1.
- а) \(7-4\frac{5}{9}=2\frac{4}{9}\).
- б) \(4\frac{3}{10}+1\frac{5}{12}=5+\frac{18}{60}+\frac{25}{60}=5\frac{43}{60}\).
- в) \(6\frac{13}{21}+2\frac{9}{14}=8+\frac{26}{42}+\frac{27}{42}=9\frac{11}{42}\).
- г) \(5\frac{1}{6}-3\frac{3}{4}=1+\frac{2}{12}+1-\frac{9}{12}=1\frac{5}{12}\).
2.
- а) \(2{,}25=2\frac{1}{4}\). Тогда \(3\frac{5}{6}-2\frac{1}{4}+5\frac{5}{12}=1\frac{7}{12}+5\frac{5}{12}=7\).
- б) \(3{,}75=3\frac{3}{4}\). Тогда \(4\frac{3}{4}-3\frac{3}{4}+8\frac{8}{9}=1+8\frac{8}{9}=9\frac{8}{9}\).
