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 >

10x^2+20x+5=0

解答

10 x^{2} + 20 x + 5 = 0

解答

x = \frac{- 2 + 2}{2}, x = - \frac{2 + 1}{2}

+1

十进制

x = - 0.29289 \dots, x = - 1.70710 \dots

求解步骤

10 x^{2} + 20 x + 5 = 0

使用求根公式求解

x_{1, 2} = \frac{- 20 \pm 2 0 ^{2} - 4 \cdot 10 \cdot 5}{2 \cdot 10}

2 0^{2} - 4 \cdot 10 \cdot 5 = 102

x_{1, 2} = \frac{- 20 \pm 10 2}{2 \cdot 10}

将解分隔开

x_{1} = \frac{- 20 + 10 2}{2 \cdot 10}, x_{2} = \frac{- 20 - 10 2}{2 \cdot 10}

x = \frac{- 20 + 10 2}{2 \cdot 10} : \frac{- 2 + 2}{2}

x = \frac{- 20 - 10 2}{2 \cdot 10} : - \frac{2 + 1}{2}

二次方程组的解是:

x = \frac{- 2 + 2}{2}, x = - \frac{2 + 1}{2}

作图

流行的例子

- 2 p^{2} + 3 p + 6 = 0

- 9 x^{2} + x - 8 = 0

(x - 21)^{2} = 484

X^3=(X-300)^3+100

X^{3} = (X - 300)^{3} + 100

b^{2} - b - 12 = 0