Ответ:
а) \(7-4\frac{5}{9}=6\frac{9}{9}-4\frac{5}{9}=2\frac{4}{9}\).
б) \(4\frac{3}{10}+1\frac{5}{12}=5+\frac{18}{60}+\frac{25}{60}=5\frac{43}{60}\).
в) \(6\frac{15}{21}+2\frac{9}{14}=6\frac{5}{7}+2\frac{9}{14}=8+\frac{10}{14}+\frac{9}{14}=9\frac{5}{14}\).
г) \(5\frac{1}{6}-3\frac{3}{4}=\frac{61}{12}-\frac{45}{12}=\frac{16}{12}=1\frac{1}{3}\).
Ответ: а) \(2\frac{4}{9}\); б) \(5\frac{43}{60}\); в) \(9\frac{5}{14}\); г) \(1\frac{1}{3}\).
