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 >

r^2-8r=-8

解答

r^{2} - 8 r = - 8

解答

r = 2 (2 + 2), r = 2 (2 - 2)

+1

十进制

r = 6.82842 \dots, r = 1.17157 \dots

求解步骤

r^{2} - 8 r = - 8

将

8

para o lado esquerdo

r^{2} - 8 r + 8 = 0

使用求根公式求解

r_{1, 2} = \frac{- ( - 8 ) \pm ( - 8 ) ^{2} - 4 \cdot 1 \cdot 8}{2 \cdot 1}

(- 8)^{2} - 4 \cdot 1 \cdot 8 = 42

r_{1, 2} = \frac{- ( - 8 ) \pm 4 2}{2 \cdot 1}

将解分隔开

r_{1} = \frac{- ( - 8 ) + 4 2}{2 \cdot 1}, r_{2} = \frac{- ( - 8 ) - 4 2}{2 \cdot 1}

r = \frac{- ( - 8 ) + 4 2}{2 \cdot 1} : 2 (2 + 2)

r = \frac{- ( - 8 ) - 4 2}{2 \cdot 1} : 2 (2 - 2)

二次方程组的解是:

r = 2 (2 + 2), r = 2 (2 - 2)

作图

流行的例子

12 x^{2} - 17 x + 6 = 0

12x^2-184x+480=0

12 x^{2} - 184 x + 480 = 0

因式分解 x^2-6x+5=0

f a c t or x^{2} - 6 x + 5 = 0

4 x^{2} + 24 x - 11 = 0

16 x^{2} + 6 x = 0