\[\boxed{\text{453\ (453).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[\textbf{а)}\ \sqrt{a + 2\sqrt{a - 1}} =\]
\[= \sqrt{(a - 1) + 1 + 2\sqrt{a - 1}} =\]
\[= \sqrt{\left( \sqrt{a - 1} + 1 \right)^{2}} = \sqrt{a - 1} + 1\]
\[= \sqrt{a + b} + 1 - \sqrt{a + b} + 1 = 2\]
\[\boxed{\text{453.}\text{\ }\text{еуроки}\text{-}\text{ответы}\text{\ }\text{на}\text{\ }\text{пятёрку}}\]
Пояснение.
Решение.
\[\textbf{а)}\ \frac{23}{64} = 0,359375(0)\]
\[\textbf{б)} - \frac{7}{25} = - 0,28(0)\]
\[\textbf{в)}\ \frac{11}{13} = 0,(846153)\]
\[\textbf{г)}\ \frac{1}{27} = 0,(037)\]
\[\textbf{д)}\ \frac{2}{35} = 0,0(571428)\]
\[\textbf{е)} - \frac{7}{22} = - 0,3(18)\]
\[\textbf{ж)}\ \frac{23}{30} = 0,7(6)\]
\[\textbf{з)}\ \frac{12}{55} = 0,2(18)\]