Ответ:

  1. \(\sqrt{121\cdot64}=\sqrt{11^2\cdot8^2}=11\cdot8=88\).

  2. \(0{,}25=\frac14\).

    \(\sqrt{16\cdot\frac49\cdot\frac14}=\sqrt{\frac{16}{9}}=\frac43\).

  3. \(\sqrt{27\cdot12}=\sqrt{324}=18\).

  4. \(77\cdot24\cdot33\cdot14=(7\cdot11)(2^3\cdot3)(3\cdot11)(2\cdot7)=(2^2\cdot3\cdot7\cdot11)^2\).

    \(\sqrt{77\cdot24\cdot33\cdot14}=2^2\cdot3\cdot7\cdot11=924\).

  5. \(21\cdot65\cdot39\cdot35=(3\cdot7)(5\cdot13)(3\cdot13)(5\cdot7)=(3\cdot5\cdot7\cdot13)^2\).

    \(\sqrt{21\cdot65\cdot39\cdot35}=3\cdot5\cdot7\cdot13=1365\).