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 >

G(x)=-2x^2+80x

解答

G (x) = - 2 x^{2} + 80 x

解答

x = 0, x = \frac{80 - G}{2}

求解步骤

G (x) = - 2 x^{2} + 80 x

整理后得

G x = - 2 x^{2} + 80 x

交换两边

- 2 x^{2} + 80 x = G x

将

G x

para o lado esquerdo

- 2 x^{2} + 80 x - G x = 0

改写成标准形式

a x^{2} + b x + c = 0

- 2 x^{2} + (80 - G) x = 0

使用求根公式求解

x_{1, 2} = \frac{- ( 80 - G ) \pm ( 80 - G ) ^{2} - 4 ( - 2 ) \cdot 0}{2 ( - 2 )}

化简

(80 - G)^{2} - 4 (- 2) \cdot 0 : - G + 80

x_{1, 2} = \frac{- ( 80 - G ) \pm ( - G + 80 )}{2 ( - 2 )}

将解分隔开

x_{1} = \frac{- ( 80 - G ) - G + 80}{2 ( - 2 )}, x_{2} = \frac{- ( 80 - G ) - ( - G + 80 )}{2 ( - 2 )}

x = \frac{- ( 80 - G ) - G + 80}{2 ( - 2 )} : 0

x = \frac{- ( 80 - G ) - ( - G + 80 )}{2 ( - 2 )} : \frac{80 - G}{2}

二次方程组的解是:

x = 0, x = \frac{80 - G}{2}

作图

流行的例子

0 = x^{2} + 12 x + 11

12x^2-368x+1891=0

12 x^{2} - 368 x + 1891 = 0

v^{2} = 18 v

solvefor x,z=x^2y

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

b^{2} - 16 b + 64 = 0