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 >

9x^2-28x+3=0

解答

9 x^{2} - 28 x + 3 = 0

解答

x = 3, x = \frac{1}{9}

+1

十进制

x = 3, x = 0.11111 \dots

求解步骤

9 x^{2} - 28 x + 3 = 0

使用求根公式求解

x_{1, 2} = \frac{- ( - 28 ) \pm ( - 28 ) ^{2} - 4 \cdot 9 \cdot 3}{2 \cdot 9}

(- 28)^{2} - 4 \cdot 9 \cdot 3 = 26

x_{1, 2} = \frac{- ( - 28 ) \pm 26}{2 \cdot 9}

将解分隔开

x_{1} = \frac{- ( - 28 ) + 26}{2 \cdot 9}, x_{2} = \frac{- ( - 28 ) - 26}{2 \cdot 9}

x = \frac{- ( - 28 ) + 26}{2 \cdot 9} : 3

x = \frac{- ( - 28 ) - 26}{2 \cdot 9} : \frac{1}{9}

二次方程组的解是:

x = 3, x = \frac{1}{9}

作图

流行的例子

x^{2} - 10 = - 14 - 5 x

x^{2} - 7 = 3 x

4 (3 x - 5)^{2} + 5 = 13

3 x^{2} = 2 x + 4

completesquare x^2-26x

co m pl e t es q u a re x^{2} - 26 x