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受欢迎的代数 >

-0.25x^2+3x-6.29=0

解答

- 0.25 x^{2} + 3 x - 6.29 = 0

解答

x = \frac{30 - 271}{5}, x = \frac{30 + 271}{5}

+1

十进制

x = 2.70758 \dots, x = 9.29241 \dots

求解步骤

- 0.25 x^{2} + 3 x - 6.29 = 0

在两边乘以

100

- 25 x^{2} + 300 x - 629 = 0

使用求根公式求解

x_{1, 2} = \frac{- 300 \pm 30 0 ^{2} - 4 ( - 25 ) ( - 629 )}{2 ( - 25 )}

30 0^{2} - 4 (- 25) (- 629) = 10271

x_{1, 2} = \frac{- 300 \pm 10 271}{2 ( - 25 )}

将解分隔开

x_{1} = \frac{- 300 + 10 271}{2 ( - 25 )}, x_{2} = \frac{- 300 - 10 271}{2 ( - 25 )}

x = \frac{- 300 + 10 271}{2 ( - 25 )} : \frac{30 - 271}{5}

x = \frac{- 300 - 10 271}{2 ( - 25 )} : \frac{30 + 271}{5}

二次方程组的解是:

x = \frac{30 - 271}{5}, x = \frac{30 + 271}{5}

作图

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