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受欢迎的代数 >

3x^2-x=x^2-4x

解答

3 x^{2} - x = x^{2} - 4 x

解答

x = 0, x = - \frac{3}{2}

+1

十进制

x = 0, x = - 1.5

求解步骤

3 x^{2} - x = x^{2} - 4 x

将

4 x

para o lado esquerdo

3 x^{2} + 3 x = x^{2}

将

x^{2}

para o lado esquerdo

2 x^{2} + 3 x = 0

使用求根公式求解

x_{1, 2} = \frac{- 3 \pm 3 ^{2} - 4 \cdot 2 \cdot 0}{2 \cdot 2}

3^{2} - 4 \cdot 2 \cdot 0 = 3

x_{1, 2} = \frac{- 3 \pm 3}{2 \cdot 2}

将解分隔开

x_{1} = \frac{- 3 + 3}{2 \cdot 2}, x_{2} = \frac{- 3 - 3}{2 \cdot 2}

x = \frac{- 3 + 3}{2 \cdot 2} : 0

x = \frac{- 3 - 3}{2 \cdot 2} : - \frac{3}{2}

二次方程组的解是:

x = 0, x = - \frac{3}{2}

作图

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