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受欢迎的代数 >

x^2-15/81 = 539/891

解答

x^{2} - \frac{15}{81} = \frac{539}{891}

解答

x = \frac{8}{9}, x = - \frac{8}{9}

+1

十进制

x = 0.88888 \dots, x = - 0.88888 \dots

求解步骤

x^{2} - \frac{15}{81} = \frac{539}{891}

将

\frac{15}{81}

到右边

x^{2} = \frac{49}{81} + \frac{5}{27}

化简

\frac{49}{81} + \frac{5}{27} : \frac{64}{81}

对于

x^{2} = f (a)

解为

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

x = \frac{64}{81}, x = - \frac{64}{81}

\frac{64}{81} = \frac{8}{9}

- \frac{64}{81} = - \frac{8}{9}

x = \frac{8}{9}, x = - \frac{8}{9}

作图

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