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受欢迎的代数 >

-3x^2+17x-20=0

解答

- 3 x^{2} + 17 x - 20 = 0

解答

x = \frac{5}{3}, x = 4

+1

十进制

x = 1.66666 \dots, x = 4

求解步骤

- 3 x^{2} + 17 x - 20 = 0

使用求根公式求解

x_{1, 2} = \frac{- 17 \pm 1 7 ^{2} - 4 ( - 3 ) ( - 20 )}{2 ( - 3 )}

1 7^{2} - 4 (- 3) (- 20) = 7

x_{1, 2} = \frac{- 17 \pm 7}{2 ( - 3 )}

将解分隔开

x_{1} = \frac{- 17 + 7}{2 ( - 3 )}, x_{2} = \frac{- 17 - 7}{2 ( - 3 )}

x = \frac{- 17 + 7}{2 ( - 3 )} : \frac{5}{3}

x = \frac{- 17 - 7}{2 ( - 3 )} : 4

二次方程组的解是:

x = \frac{5}{3}, x = 4

作图

流行的例子

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