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^2-5x+6=2x^2+4x-11

解答

- x^{2} - 5 x + 6 = 2 x^{2} + 4 x - 11

解答

x = - \frac{9 + 285}{6}, x = \frac{285 - 9}{6}

+1

十进制

x = - 4.31365 \dots, x = 1.31365 \dots

求解步骤

- x^{2} - 5 x + 6 = 2 x^{2} + 4 x - 11

将

11

para o lado esquerdo

- x^{2} - 5 x + 17 = 2 x^{2} + 4 x

将

4 x

para o lado esquerdo

- x^{2} - 9 x + 17 = 2 x^{2}

将

2 x^{2}

para o lado esquerdo

- 3 x^{2} - 9 x + 17 = 0

使用求根公式求解

x_{1, 2} = \frac{- ( - 9 ) \pm ( - 9 ) ^{2} - 4 ( - 3 ) \cdot 17}{2 ( - 3 )}

(- 9)^{2} - 4 (- 3) \cdot 17 = 285

x_{1, 2} = \frac{- ( - 9 ) \pm 285}{2 ( - 3 )}

将解分隔开

x_{1} = \frac{- ( - 9 ) + 285}{2 ( - 3 )}, x_{2} = \frac{- ( - 9 ) - 285}{2 ( - 3 )}

x = \frac{- ( - 9 ) + 285}{2 ( - 3 )} : - \frac{9 + 285}{6}

x = \frac{- ( - 9 ) - 285}{2 ( - 3 )} : \frac{285 - 9}{6}

二次方程组的解是:

x = - \frac{9 + 285}{6}, x = \frac{285 - 9}{6}

作图

流行的例子

x^2-9x+81/4 = 1/4

x^{2} - 9 x + \frac{81}{4} = \frac{1}{4}

0.5x+6=2(2x-3)x

0.5 x + 6 = 2 (2 x - 3) x

solvefor x,f=3x^2yz-xy^2z^2

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

8 x^{2} = 12 - 4 x

completesquare s^2-2s+10

co m pl e t es q u a re s^{2} - 2 s + 10