x^2= 49/81

解

x^{2} = \frac{49}{81}

x = \frac{7}{9}, x = - \frac{7}{9}

十進法表記

x = 0.77777 \dots, x = - 0.77777 \dots

解答ステップ

x^{2} = \frac{49}{81}

x^{2} = f (a)

の場合, 解は

x = f (a), - f (a)

x = \frac{49}{81}, x = - \frac{49}{81}

\frac{49}{81} = \frac{7}{9}

- \frac{49}{81} = - \frac{7}{9}

x = \frac{7}{9}, x = - \frac{7}{9}