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 >

5d^2+10d+8=2d^2

解答

5 d^{2} + 10 d + 8 = 2 d^{2}

解答

d = - \frac{4}{3}, d = - 2

+1

十进制

d = - 1.33333 \dots, d = - 2

求解步骤

5 d^{2} + 10 d + 8 = 2 d^{2}

将

2 d^{2}

para o lado esquerdo

3 d^{2} + 10 d + 8 = 0

使用求根公式求解

d_{1, 2} = \frac{- 10 \pm 1 0 ^{2} - 4 \cdot 3 \cdot 8}{2 \cdot 3}

1 0^{2} - 4 \cdot 3 \cdot 8 = 2

d_{1, 2} = \frac{- 10 \pm 2}{2 \cdot 3}

将解分隔开

d_{1} = \frac{- 10 + 2}{2 \cdot 3}, d_{2} = \frac{- 10 - 2}{2 \cdot 3}

d = \frac{- 10 + 2}{2 \cdot 3} : - \frac{4}{3}

d = \frac{- 10 - 2}{2 \cdot 3} : - 2

二次方程组的解是:

d = - \frac{4}{3}, d = - 2

作图

流行的例子

a^2+120^2=370^2

化简 4/3 pi(1.95)^3

1-0.8x+0.15x^2=0