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受欢迎的代数 >

-x^2+90x-130.65=0

解答

- x^{2} + 90 x - 130.65 = 0

解答

x = \frac{450 - 189435}{10}, x = \frac{450 + 189435}{10}

+1

十进制

x = 1.47586 \dots, x = 88.52413 \dots

求解步骤

- x^{2} + 90 x - 130.65 = 0

在两边乘以

100

- 100 x^{2} + 9000 x - 13065 = 0

使用求根公式求解

x_{1, 2} = \frac{- 9000 \pm 900 0 ^{2} - 4 ( - 100 ) ( - 13065 )}{2 ( - 100 )}

900 0^{2} - 4 (- 100) (- 13065) = 20189435

x_{1, 2} = \frac{- 9000 \pm 20 189435}{2 ( - 100 )}

将解分隔开

x_{1} = \frac{- 9000 + 20 189435}{2 ( - 100 )}, x_{2} = \frac{- 9000 - 20 189435}{2 ( - 100 )}

x = \frac{- 9000 + 20 189435}{2 ( - 100 )} : \frac{450 - 189435}{10}

x = \frac{- 9000 - 20 189435}{2 ( - 100 )} : \frac{450 + 189435}{10}

二次方程组的解是:

x = \frac{450 - 189435}{10}, x = \frac{450 + 189435}{10}

作图

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