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 >

-0.2x^2+3x+0.25=0

解答

- 0.2 x^{2} + 3 x + 0.25 = 0

解答

x = - \frac{- 15 + 230}{2}, x = \frac{15 + 230}{2}

+1

十进制

x = - 0.08287 \dots, x = 15.08287 \dots

求解步骤

- 0.2 x^{2} + 3 x + 0.25 = 0

在两边乘以

100

- 20 x^{2} + 300 x + 25 = 0

使用求根公式求解

x_{1, 2} = \frac{- 300 \pm 30 0 ^{2} - 4 ( - 20 ) \cdot 25}{2 ( - 20 )}

30 0^{2} - 4 (- 20) \cdot 25 = 20230

x_{1, 2} = \frac{- 300 \pm 20 230}{2 ( - 20 )}

将解分隔开

x_{1} = \frac{- 300 + 20 230}{2 ( - 20 )}, x_{2} = \frac{- 300 - 20 230}{2 ( - 20 )}

x = \frac{- 300 + 20 230}{2 ( - 20 )} : - \frac{- 15 + 230}{2}

x = \frac{- 300 - 20 230}{2 ( - 20 )} : \frac{15 + 230}{2}

二次方程组的解是:

x = - \frac{- 15 + 230}{2}, x = \frac{15 + 230}{2}

作图

流行的例子

- 110 = 10 - 5 x^{2}

x^{2} + 13 x + 27 = 0

- 2^{2} + 3^{2} = c^{2}

completesquare 4x^2+4x+65

co m pl e t es q u a re 4 x^{2} + 4 x + 65

solvefor y,4y^2+18=96x

so l v e f or y, 4 y^{2} + 18 = 96 x