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 >

(x(x-3))/2 =28

解答

\frac{x ( x - 3 )}{2} = 28

解答

x = \frac{3 + 233}{2}, x = \frac{3 - 233}{2}

+1

十进制

x = 9.13216 \dots, x = - 6.13216 \dots

求解步骤

\frac{x ( x - 3 )}{2} = 28

在两边乘以

2

x (x - 3) = 56

展开

x (x - 3) : x^{2} - 3 x

x^{2} - 3 x = 56

将

56

para o lado esquerdo

x^{2} - 3 x - 56 = 0

使用求根公式求解

x_{1, 2} = \frac{- ( - 3 ) \pm ( - 3 ) ^{2} - 4 \cdot 1 \cdot ( - 56 )}{2 \cdot 1}

(- 3)^{2} - 4 \cdot 1 \cdot (- 56) = 233

x_{1, 2} = \frac{- ( - 3 ) \pm 233}{2 \cdot 1}

将解分隔开

x_{1} = \frac{- ( - 3 ) + 233}{2 \cdot 1}, x_{2} = \frac{- ( - 3 ) - 233}{2 \cdot 1}

x = \frac{- ( - 3 ) + 233}{2 \cdot 1} : \frac{3 + 233}{2}

x = \frac{- ( - 3 ) - 233}{2 \cdot 1} : \frac{3 - 233}{2}

二次方程组的解是:

x = \frac{3 + 233}{2}, x = \frac{3 - 233}{2}

作图

流行的例子

0.02a^2-0.02a-0.01=0

0.02 a^{2} - 0.02 a - 0.01 = 0

(3 x - 4) (x + 2) = 8

3 t^{2} - 3 t - 5 = 0

(x - 9) (x + 5) = - 13

solvefor x,x^2-yx+64=0

so l v e f or x, x^{2} - y x + 64 = 0