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 >

x^2+0.9x-7.92=0

解答

x^{2} + 0.9 x - 7.92 = 0

解答

x = \frac{12}{5}, x = - \frac{33}{10}

+1

十进制

x = 2.4, x = - 3.3

求解步骤

x^{2} + 0.9 x - 7.92 = 0

在两边乘以

100

100 x^{2} + 90 x - 792 = 0

使用求根公式求解

x_{1, 2} = \frac{- 90 \pm 9 0 ^{2} - 4 \cdot 100 ( - 792 )}{2 \cdot 100}

9 0^{2} - 4 \cdot 100 (- 792) = 570

x_{1, 2} = \frac{- 90 \pm 570}{2 \cdot 100}

将解分隔开

x_{1} = \frac{- 90 + 570}{2 \cdot 100}, x_{2} = \frac{- 90 - 570}{2 \cdot 100}

x = \frac{- 90 + 570}{2 \cdot 100} : \frac{12}{5}

x = \frac{- 90 - 570}{2 \cdot 100} : - \frac{33}{10}

二次方程组的解是:

x = \frac{12}{5}, x = - \frac{33}{10}

作图

流行的例子

y^{2} + 4 y - 6 = 0

12x^2-288x+1152=0

12 x^{2} - 288 x + 1152 = 0

(X + 6) (X - 6) = 13

completesquare x^2+17x+12=0

co m pl e t es q u a re x^{2} + 17 x + 12 = 0

23 x = - 15 x^{2} - 6