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受欢迎的代数 >

200x-x^2=25x+6900

解答

200 x - x^{2} = 25 x + 6900

解答

x = 60, x = 115

求解步骤

200 x - x^{2} = 25 x + 6900

将

6900

para o lado esquerdo

200 x - x^{2} - 6900 = 25 x

将

25 x

para o lado esquerdo

- x^{2} + 175 x - 6900 = 0

使用求根公式求解

x_{1, 2} = \frac{- 175 \pm 17 5 ^{2} - 4 ( - 1 ) ( - 6900 )}{2 ( - 1 )}

17 5^{2} - 4 (- 1) (- 6900) = 55

x_{1, 2} = \frac{- 175 \pm 55}{2 ( - 1 )}

将解分隔开

x_{1} = \frac{- 175 + 55}{2 ( - 1 )}, x_{2} = \frac{- 175 - 55}{2 ( - 1 )}

x = \frac{- 175 + 55}{2 ( - 1 )} : 60

x = \frac{- 175 - 55}{2 ( - 1 )} : 115

二次方程组的解是:

x = 60, x = 115

作图

流行的例子

4 s - 2 s = 18

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因式分解-6+9i

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