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 >

(4-x)x+x=2

解答

(4 - x) x + x = 2

解答

x = \frac{5 - 17}{2}, x = \frac{5 + 17}{2}

+1

十进制

x = 0.43844 \dots, x = 4.56155 \dots

求解步骤

(4 - x) x + x = 2

展开

(4 - x) x + x : - x^{2} + 5 x

- x^{2} + 5 x = 2

将

2

para o lado esquerdo

- x^{2} + 5 x - 2 = 0

使用求根公式求解

x_{1, 2} = \frac{- 5 \pm 5 ^{2} - 4 ( - 1 ) ( - 2 )}{2 ( - 1 )}

5^{2} - 4 (- 1) (- 2) = 17

x_{1, 2} = \frac{- 5 \pm 17}{2 ( - 1 )}

将解分隔开

x_{1} = \frac{- 5 + 17}{2 ( - 1 )}, x_{2} = \frac{- 5 - 17}{2 ( - 1 )}

x = \frac{- 5 + 17}{2 ( - 1 )} : \frac{5 - 17}{2}

x = \frac{- 5 - 17}{2 ( - 1 )} : \frac{5 + 17}{2}

二次方程组的解是:

x = \frac{5 - 17}{2}, x = \frac{5 + 17}{2}

作图

流行的例子

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

x^{2} - 3 x + 25 = 0

- 6 y^{2} + 4 y = - 3 y + 2

4 a^{2} - 63 = 4 a

- 4 x^{2} + 5 = - 59