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 >

7a^2-29a-30=0

解答

7 a^{2} - 29 a - 30 = 0

解答

a = 5, a = - \frac{6}{7}

+1

十进制

a = 5, a = - 0.85714 \dots

求解步骤

7 a^{2} - 29 a - 30 = 0

使用求根公式求解

a_{1, 2} = \frac{- ( - 29 ) \pm ( - 29 ) ^{2} - 4 \cdot 7 ( - 30 )}{2 \cdot 7}

(- 29)^{2} - 4 \cdot 7 (- 30) = 41

a_{1, 2} = \frac{- ( - 29 ) \pm 41}{2 \cdot 7}

将解分隔开

a_{1} = \frac{- ( - 29 ) + 41}{2 \cdot 7}, a_{2} = \frac{- ( - 29 ) - 41}{2 \cdot 7}

a = \frac{- ( - 29 ) + 41}{2 \cdot 7} : 5

a = \frac{- ( - 29 ) - 41}{2 \cdot 7} : - \frac{6}{7}

二次方程组的解是:

a = 5, a = - \frac{6}{7}

作图

流行的例子

200= 2/125 t^2-16/5 t+320

200 = \frac{2}{125} t^{2} - \frac{16}{5} t + 320

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

P^2=2.97370166*10^{-19}*1495978707000^3

P^{2} = 2.97370166 \cdot 1 0^{- 19} \cdot 149597870700 0^{3}

solvefor x,(f\circ g)(x)=3x^2+1

so l v e f or x, (f \circ g) (x) = 3 x^{2} + 1

1 5^{2} + 1 4^{2} = x^{2}