zs

English

Español

Português

Français

Deutsch

Italiano

Русский

中文(简体)

한국어

日本語

Tiếng Việt

עברית

العربية

受欢迎的代数 >

-2x^2+36x+138=0

解答

- 2 x^{2} + 36 x + 138 = 0

解答

x = 9 - 56, x = 9 + 56

+1

十进制

x = - 3.24744 \dots, x = 21.24744 \dots

求解步骤

- 2 x^{2} + 36 x + 138 = 0

使用求根公式求解

x_{1, 2} = \frac{- 36 \pm 3 6 ^{2} - 4 ( - 2 ) \cdot 138}{2 ( - 2 )}

3 6^{2} - 4 (- 2) \cdot 138 = 206

x_{1, 2} = \frac{- 36 \pm 20 6}{2 ( - 2 )}

将解分隔开

x_{1} = \frac{- 36 + 20 6}{2 ( - 2 )}, x_{2} = \frac{- 36 - 20 6}{2 ( - 2 )}

x = \frac{- 36 + 20 6}{2 ( - 2 )} : 9 - 56

x = \frac{- 36 - 20 6}{2 ( - 2 )} : 9 + 56

二次方程组的解是:

x = 9 - 56, x = 9 + 56

作图

流行的例子

因式分解 12x^2+23xy-24y^2

f a c t or 12 x^{2} + 23 x y - 24 y^{2}

x + 3 < 4

3(w+1)+2w=5(w-1)+5

3 (w + 1) + 2 w = 5 (w - 1) + 5

∣ v ∣ \geq 2

\frac{9 x + 2}{3} = 3 x + 3