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 >

199=0.1w^2+2.155w+19.985

解答

199 = 0.1 w^{2} + 2.155 w + 19.985

解答

w = \frac{- 431 + 3 338889}{40}, w = - \frac{431 + 3 338889}{40}

+1

十进制

w = 32.88563 \dots, w = - 54.43563 \dots

求解步骤

199 = 0.1 w^{2} + 2.155 w + 19.985

在两边乘以

1000

199000 = 100 w^{2} + 2155 w + 19985

交换两边

100 w^{2} + 2155 w + 19985 = 199000

将

199000

para o lado esquerdo

100 w^{2} + 2155 w - 179015 = 0

使用求根公式求解

w_{1, 2} = \frac{- 2155 \pm 215 5 ^{2} - 4 \cdot 100 ( - 179015 )}{2 \cdot 100}

215 5^{2} - 4 \cdot 100 (- 179015) = 15338889

w_{1, 2} = \frac{- 2155 \pm 15 338889}{2 \cdot 100}

将解分隔开

w_{1} = \frac{- 2155 + 15 338889}{2 \cdot 100}, w_{2} = \frac{- 2155 - 15 338889}{2 \cdot 100}

w = \frac{- 2155 + 15 338889}{2 \cdot 100} : \frac{- 431 + 3 338889}{40}

w = \frac{- 2155 - 15 338889}{2 \cdot 100} : - \frac{431 + 3 338889}{40}

二次方程组的解是:

w = \frac{- 431 + 3 338889}{40}, w = - \frac{431 + 3 338889}{40}

作图

流行的例子

49 x^{2} - 3 = 13

2x*(x-3)-x*(x-3)=0

2 x \cdot (x - 3) - x \cdot (x - 3) = 0

x^2-2x+1-x=-2x^2+x

x^{2} - 2 x + 1 - x = - 2 x^{2} + x

5 (x - 2)^{2} = - 20

- x^{2} + 7 x + 3 = 0