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受欢迎的代数 >

4x^2+25-20x+4x^2=17

解答

4 x^{2} + 25 - 20 x + 4 x^{2} = 17

解答

x = 2, x = \frac{1}{2}

+1

十进制

x = 2, x = 0.5

求解步骤

4 x^{2} + 25 - 20 x + 4 x^{2} = 17

整理后得

8 x^{2} - 20 x + 25 = 17

将

17

para o lado esquerdo

8 x^{2} - 20 x + 8 = 0

使用求根公式求解

x_{1, 2} = \frac{- ( - 20 ) \pm ( - 20 ) ^{2} - 4 \cdot 8 \cdot 8}{2 \cdot 8}

(- 20)^{2} - 4 \cdot 8 \cdot 8 = 12

x_{1, 2} = \frac{- ( - 20 ) \pm 12}{2 \cdot 8}

将解分隔开

x_{1} = \frac{- ( - 20 ) + 12}{2 \cdot 8}, x_{2} = \frac{- ( - 20 ) - 12}{2 \cdot 8}

x = \frac{- ( - 20 ) + 12}{2 \cdot 8} : 2

x = \frac{- ( - 20 ) - 12}{2 \cdot 8} : \frac{1}{2}

二次方程组的解是:

x = 2, x = \frac{1}{2}

作图

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