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受欢迎的代数 >

2.07x^2-3.79x+1.34=0

解答

2.07 x^{2} - 3.79 x + 1.34 = 0

解答

x = \frac{379 + 32689}{414}, x = \frac{379 - 32689}{414}

+1

十进制

x = 1.35217 \dots, x = 0.47874 \dots

求解步骤

2.07 x^{2} - 3.79 x + 1.34 = 0

在两边乘以

100

207 x^{2} - 379 x + 134 = 0

使用求根公式求解

x_{1, 2} = \frac{- ( - 379 ) \pm ( - 379 ) ^{2} - 4 \cdot 207 \cdot 134}{2 \cdot 207}

(- 379)^{2} - 4 \cdot 207 \cdot 134 = 32689

x_{1, 2} = \frac{- ( - 379 ) \pm 32689}{2 \cdot 207}

将解分隔开

x_{1} = \frac{- ( - 379 ) + 32689}{2 \cdot 207}, x_{2} = \frac{- ( - 379 ) - 32689}{2 \cdot 207}

x = \frac{- ( - 379 ) + 32689}{2 \cdot 207} : \frac{379 + 32689}{414}

x = \frac{- ( - 379 ) - 32689}{2 \cdot 207} : \frac{379 - 32689}{414}

二次方程组的解是:

x = \frac{379 + 32689}{414}, x = \frac{379 - 32689}{414}

作图

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