\[\boxed{\text{395\ (395).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
Пояснение.
Решение.
\[1)\text{\ x}^{2} = 25\]
\[x = \pm 5\]
\[Ответ:x = 5;x = - 5.\]
\[2)\ x^{2} = 0,49\]
\[x = \pm 0,7\]
\[Ответ:x = 0,7;\ x = - 0,7.\]
\[3)\ x^{2} = 3\]
\[x = \pm \sqrt{3}\]
\[Ответ:x = \pm \sqrt{3}\text{..}\]
\[4)\ x^{2} = - 25\]
\[Ответ:нет\ корней.\]
\[\boxed{\text{3}\text{95}\text{.}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[1)\ x^{2} = 9\]
\[x = \pm 3.\]
\[2)\ x^{2} = \frac{36}{49}\]
\[x = \pm \frac{6}{7}.\]