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受欢迎的代数 >

39x^2-83x=56

解答

39 x^{2} - 83 x = 56

解答

x = \frac{8}{3}, x = - \frac{7}{13}

+1

十进制

x = 2.66666 \dots, x = - 0.53846 \dots

求解步骤

39 x^{2} - 83 x = 56

将

56

para o lado esquerdo

39 x^{2} - 83 x - 56 = 0

使用求根公式求解

x_{1, 2} = \frac{- ( - 83 ) \pm ( - 83 ) ^{2} - 4 \cdot 39 ( - 56 )}{2 \cdot 39}

(- 83)^{2} - 4 \cdot 39 (- 56) = 125

x_{1, 2} = \frac{- ( - 83 ) \pm 125}{2 \cdot 39}

将解分隔开

x_{1} = \frac{- ( - 83 ) + 125}{2 \cdot 39}, x_{2} = \frac{- ( - 83 ) - 125}{2 \cdot 39}

x = \frac{- ( - 83 ) + 125}{2 \cdot 39} : \frac{8}{3}

x = \frac{- ( - 83 ) - 125}{2 \cdot 39} : - \frac{7}{13}

二次方程组的解是:

x = \frac{8}{3}, x = - \frac{7}{13}

作图

流行的例子

(2 - x) (4 - x) + 2 = 0

- 12 x - x^{2} = 0

2 x^{2} - 12 x + 1 = 15

x^{2} - \frac{x}{3} = 0

completesquare x^2+10x-7

co m pl e t es q u a re x^{2} + 10 x - 7