Ответ:

  1. \(\frac{10}{9}=1\frac{1}{9}\);
  2. \(\frac{15}{7}=2\frac{1}{7}\);
  3. \(\frac{45}{10}=4\frac{5}{10}=4\frac{1}{2}\);
  4. \(\frac{56}{9}=6\frac{2}{9}\);
  5. \(\frac{87}{21}=4\frac{3}{21}=4\frac{1}{7}\).