\[\boxed{\text{364.}\text{\ }\text{еуроки}\text{-}\text{ответы}\text{\ }\text{на}\text{\ }\text{пятёрку}}\]
Пояснение.
Решение.
\[\textbf{а)}\ \sqrt{81 \cdot 900} = 9 \cdot 30 = 270\]
\[\textbf{б)}\ \sqrt{0,36 \cdot 49} = 0,6 \cdot 7 = 4,2\]
\[\textbf{в)}\ \sqrt{12\frac{1}{4}} = \sqrt{\frac{49}{4}} = \frac{7}{2} = 3,5\]
\[\textbf{г)}\ \sqrt{10\frac{9}{16}} = \sqrt{\frac{169}{16}} = \frac{13}{4} = 3\frac{1}{4} =\]
\[= 3,25\]