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受欢迎的代数 >

39.1179765x-4.9x^2+125=0

解答

39.1179765 x - 4.9 x^{2} + 125 = 0

解答

x = - \frac{- 39.1179765 + 3980.21608 \dots}{9.8}, x = \frac{39.1179765 + 3980.21608 \dots}{9.8}

+1

十进制

x = - 2.44601 \dots, x = 10.42927 \dots

求解步骤

39.1179765 x - 4.9 x^{2} + 125 = 0

改写成标准形式

a x^{2} + b x + c = 0

- 4.9 x^{2} + 39.1179765 x + 125 = 0

使用求根公式求解

x_{1, 2} = \frac{- 39.1179765 \pm 39.117976 5 ^{2} - 4 ( - 4.9 ) \cdot 125}{2 ( - 4.9 )}

39.117976 5^{2} - 4 (- 4.9) \cdot 125 = 3980.21608 \dots

x_{1, 2} = \frac{- 39.1179765 \pm 3980.21608 \dots}{2 ( - 4.9 )}

将解分隔开

x_{1} = \frac{- 39.1179765 + 3980.21608 \dots}{2 ( - 4.9 )}, x_{2} = \frac{- 39.1179765 - 3980.21608 \dots}{2 ( - 4.9 )}

x = \frac{- 39.1179765 + 3980.21608 \dots}{2 ( - 4.9 )} : - \frac{- 39.1179765 + 3980.21608 \dots}{9.8}

x = \frac{- 39.1179765 - 3980.21608 \dots}{2 ( - 4.9 )} : \frac{39.1179765 + 3980.21608 \dots}{9.8}

二次方程组的解是:

x = - \frac{- 39.1179765 + 3980.21608 \dots}{9.8}, x = \frac{39.1179765 + 3980.21608 \dots}{9.8}

作图

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