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受欢迎的代数 >

0=-20x^2+360x+1000

解答

0 = - 20 x^{2} + 360 x + 1000

解答

x = 9 - 131, x = 9 + 131

+1

十进制

x = - 2.44552 \dots, x = 20.44552 \dots

求解步骤

0 = - 20 x^{2} + 360 x + 1000

交换两边

- 20 x^{2} + 360 x + 1000 = 0

使用求根公式求解

x_{1, 2} = \frac{- 360 \pm 36 0 ^{2} - 4 ( - 20 ) \cdot 1000}{2 ( - 20 )}

36 0^{2} - 4 (- 20) \cdot 1000 = 40131

x_{1, 2} = \frac{- 360 \pm 40 131}{2 ( - 20 )}

将解分隔开

x_{1} = \frac{- 360 + 40 131}{2 ( - 20 )}, x_{2} = \frac{- 360 - 40 131}{2 ( - 20 )}

x = \frac{- 360 + 40 131}{2 ( - 20 )} : 9 - 131

x = \frac{- 360 - 40 131}{2 ( - 20 )} : 9 + 131

二次方程组的解是:

x = 9 - 131, x = 9 + 131

作图

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