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(4x-1)=4+2x

解答

2 x (4 x - 1) = 4 + 2 x

解答

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

+1

十进制

x = 1, x = - 0.5

求解步骤

2 x (4 x - 1) = 4 + 2 x

展开

2 x (4 x - 1) : 8 x^{2} - 2 x

8 x^{2} - 2 x = 4 + 2 x

将

2 x

para o lado esquerdo

8 x^{2} - 4 x = 4

将

4

para o lado esquerdo

8 x^{2} - 4 x - 4 = 0

使用求根公式求解

x_{1, 2} = \frac{- ( - 4 ) \pm ( - 4 ) ^{2} - 4 \cdot 8 ( - 4 )}{2 \cdot 8}

(- 4)^{2} - 4 \cdot 8 (- 4) = 12

x_{1, 2} = \frac{- ( - 4 ) \pm 12}{2 \cdot 8}

将解分隔开

x_{1} = \frac{- ( - 4 ) + 12}{2 \cdot 8}, x_{2} = \frac{- ( - 4 ) - 12}{2 \cdot 8}

x = \frac{- ( - 4 ) + 12}{2 \cdot 8} : 1

x = \frac{- ( - 4 ) - 12}{2 \cdot 8} : - \frac{1}{2}

二次方程组的解是:

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

作图

流行的例子

15 a^{2} - 3 a = 3 - 7 a

6 r + 1 \geq 2 r - 15

\frac{3 x}{2} - 2 > 7

solvefor y,x^3-3x^2y=c

so l v e f or y, x^{3} - 3 x^{2} y = c

3 ∣ x - 8 ∣ = 12