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受欢迎的代数 >

0=3x^2-5x-5

解答

0 = 3 x^{2} - 5 x - 5

解答

x = \frac{5 + 85}{6}, x = \frac{5 - 85}{6}

+1

十进制

x = 2.36992 \dots, x = - 0.70325 \dots

求解步骤

0 = 3 x^{2} - 5 x - 5

交换两边

3 x^{2} - 5 x - 5 = 0

使用求根公式求解

x_{1, 2} = \frac{- ( - 5 ) \pm ( - 5 ) ^{2} - 4 \cdot 3 ( - 5 )}{2 \cdot 3}

(- 5)^{2} - 4 \cdot 3 (- 5) = 85

x_{1, 2} = \frac{- ( - 5 ) \pm 85}{2 \cdot 3}

将解分隔开

x_{1} = \frac{- ( - 5 ) + 85}{2 \cdot 3}, x_{2} = \frac{- ( - 5 ) - 85}{2 \cdot 3}

x = \frac{- ( - 5 ) + 85}{2 \cdot 3} : \frac{5 + 85}{6}

x = \frac{- ( - 5 ) - 85}{2 \cdot 3} : \frac{5 - 85}{6}

二次方程组的解是:

x = \frac{5 + 85}{6}, x = \frac{5 - 85}{6}

作图

流行的例子

(x-512)(x+512)=0

(x - 512) (x + 512) = 0

2 v^{2} + 3 v - 5 = - 1

0 = x^{2} - 0.3 x - 0.1

solvefor a,a^2+b^2+c^2=2015

so l v e f or a, a^{2} + b^{2} + c^{2} = 2015

3 x^{2} - 11 x - 1 = 3