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受欢迎的代数 >

7x^2-9=0

解答

7 x^{2} - 9 = 0

解答

x = \frac{3}{7}, x = - \frac{3}{7}

+1

十进制

x = 1.13389 \dots, x = - 1.13389 \dots

求解步骤

7 x^{2} - 9 = 0

将

9

到右边

7 x^{2} = 9

两边除以

7

x^{2} = \frac{9}{7}

对于

x^{2} = f (a)

解为

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

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

\frac{9}{7} = \frac{3}{7}

- \frac{9}{7} = - \frac{3}{7}

x = \frac{3}{7}, x = - \frac{3}{7}

作图

流行的例子

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