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受欢迎的代数 >

0=-12x^2+120x

解答

0 = - 12 x^{2} + 120 x

解答

x = 0, x = 10

求解步骤

0 = - 12 x^{2} + 120 x

交换两边

- 12 x^{2} + 120 x = 0

使用求根公式求解

x_{1, 2} = \frac{- 120 \pm 12 0 ^{2} - 4 ( - 12 ) \cdot 0}{2 ( - 12 )}

12 0^{2} - 4 (- 12) \cdot 0 = 120

x_{1, 2} = \frac{- 120 \pm 120}{2 ( - 12 )}

将解分隔开

x_{1} = \frac{- 120 + 120}{2 ( - 12 )}, x_{2} = \frac{- 120 - 120}{2 ( - 12 )}

x = \frac{- 120 + 120}{2 ( - 12 )} : 0

x = \frac{- 120 - 120}{2 ( - 12 )} : 10

二次方程组的解是:

x = 0, x = 10

作图

流行的例子

(x - 1)^{2} = \frac{2}{3}

2 x^{2} = 250

(x + 4)^{2} - 2 = 34

3 x (2 x + 1) = 3 x - 12

9 k^{2} + 10 = 0