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受欢迎的代数 >

x^2-9x+19=0

解答

x^{2} - 9 x + 19 = 0

解答

x = \frac{9 + 5}{2}, x = \frac{9 - 5}{2}

+1

十进制

x = 5.61803 \dots, x = 3.38196 \dots

求解步骤

x^{2} - 9 x + 19 = 0

使用求根公式求解

x_{1, 2} = \frac{- ( - 9 ) \pm ( - 9 ) ^{2} - 4 \cdot 1 \cdot 19}{2 \cdot 1}

(- 9)^{2} - 4 \cdot 1 \cdot 19 = 5

x_{1, 2} = \frac{- ( - 9 ) \pm 5}{2 \cdot 1}

将解分隔开

x_{1} = \frac{- ( - 9 ) + 5}{2 \cdot 1}, x_{2} = \frac{- ( - 9 ) - 5}{2 \cdot 1}

x = \frac{- ( - 9 ) + 5}{2 \cdot 1} : \frac{9 + 5}{2}

x = \frac{- ( - 9 ) - 5}{2 \cdot 1} : \frac{9 - 5}{2}

二次方程组的解是:

x = \frac{9 + 5}{2}, x = \frac{9 - 5}{2}

作图

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