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受欢迎的代数 >

-3x^2-18x+2=0

解答

- 3 x^{2} - 18 x + 2 = 0

解答

x = - \frac{9 + 87}{3}, x = \frac{87 - 9}{3}

+1

十进制

x = - 6.10912 \dots, x = 0.10912 \dots

求解步骤

- 3 x^{2} - 18 x + 2 = 0

使用求根公式求解

x_{1, 2} = \frac{- ( - 18 ) \pm ( - 18 ) ^{2} - 4 ( - 3 ) \cdot 2}{2 ( - 3 )}

(- 18)^{2} - 4 (- 3) \cdot 2 = 287

x_{1, 2} = \frac{- ( - 18 ) \pm 2 87}{2 ( - 3 )}

将解分隔开

x_{1} = \frac{- ( - 18 ) + 2 87}{2 ( - 3 )}, x_{2} = \frac{- ( - 18 ) - 2 87}{2 ( - 3 )}

x = \frac{- ( - 18 ) + 2 87}{2 ( - 3 )} : - \frac{9 + 87}{3}

x = \frac{- ( - 18 ) - 2 87}{2 ( - 3 )} : \frac{87 - 9}{3}

二次方程组的解是:

x = - \frac{9 + 87}{3}, x = \frac{87 - 9}{3}

作图

流行的例子

x^{2} \leq x + 20

x^{2} - 10 x = - 24

2 + x = 5

\frac{x}{2} - \frac{7}{6} < \frac{4}{3}

-5(5x+3)-5x+1=-44

- 5 (5 x + 3) - 5 x + 1 = - 44