Ответ:

  1. \(\sqrt{\frac{9}{16}}=\frac{\sqrt9}{\sqrt{16}}=\frac34\).
  2. \(\sqrt{\frac{49}{81}}=\frac79\).
  3. \(\sqrt{\frac{100}{121}}=\frac{10}{11}\).
  4. \(\sqrt{\frac{144}{169}}=\frac{12}{13}\).