- \( -4\frac{1}{3}-\left(-2\frac{7}{9}\right)=-\frac{13}{3}+\frac{25}{9}=-\frac{39}{9}+\frac{25}{9}=-\frac{14}{9}=-1\frac{5}{9}.\)
- \(5\frac{2}{7}-6\frac{5}{14}=\frac{37}{7}-\frac{89}{14}=\frac{74}{14}-\frac{89}{14}=-\frac{15}{14}=-1\frac{1}{14}.\)
- \(-2\frac{3}{16}+\frac{5}{8}=-\frac{35}{16}+\frac{10}{16}=-\frac{25}{16}=-1\frac{9}{16}.\)
- \(\frac{3}{5}-0.9=0.6-0.9=-0.3.\)
Ответ: а) \(-1\frac{5}{9}\); б) \(-1\frac{1}{14}\); в) \(-1\frac{9}{16}\); г) \(-0,3\).