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受欢迎的代数 >

20x^2+5x-11=0

解答

20 x^{2} + 5 x - 11 = 0

解答

x = \frac{- 5 + 905}{40}, x = \frac{- 5 - 905}{40}

+1

十进制

x = 0.62708 \dots, x = - 0.87708 \dots

求解步骤

20 x^{2} + 5 x - 11 = 0

使用求根公式求解

x_{1, 2} = \frac{- 5 \pm 5 ^{2} - 4 \cdot 20 ( - 11 )}{2 \cdot 20}

5^{2} - 4 \cdot 20 (- 11) = 905

x_{1, 2} = \frac{- 5 \pm 905}{2 \cdot 20}

将解分隔开

x_{1} = \frac{- 5 + 905}{2 \cdot 20}, x_{2} = \frac{- 5 - 905}{2 \cdot 20}

x = \frac{- 5 + 905}{2 \cdot 20} : \frac{- 5 + 905}{40}

x = \frac{- 5 - 905}{2 \cdot 20} : \frac{- 5 - 905}{40}

二次方程组的解是:

x = \frac{- 5 + 905}{40}, x = \frac{- 5 - 905}{40}

作图

流行的例子

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