Ответ:

  1. \(\frac{3}{75}+\frac{71}{450}=\frac{18}{450}+\frac{71}{450}=\frac{89}{450}\).
  2. \(\frac{4}{7}-\frac{16}{28}=\frac{4}{7}-\frac{4}{7}=0\).
  3. \(\frac{4}{6}-\frac{5}{18}=\frac{12}{18}-\frac{5}{18}=\frac{7}{18}\).
  4. \(\frac{2}{7}-\frac{3}{14}=\frac{4}{14}-\frac{3}{14}=\frac{1}{14}\).
  5. \(\frac{7}{15}-\frac{1}{5}=\frac{7}{15}-\frac{3}{15}=\frac{4}{15}\).
  6. \(\frac{10}{15}-\frac{2}{3}=\frac{2}{3}-\frac{2}{3}=0\).
  7. \(\frac{22}{9}-\frac{7}{3}=\frac{22}{9}-\frac{21}{9}=\frac{1}{9}\).