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受欢迎的代数 >

0=-t^2+3t+27

解答

0 = - t^{2} + 3 t + 27

解答

t = - \frac{- 3 + 3 13}{2}, t = \frac{3 + 3 13}{2}

+1

十进制

t = - 3.90832 \dots, t = 6.90832 \dots

求解步骤

0 = - t^{2} + 3 t + 27

交换两边

- t^{2} + 3 t + 27 = 0

使用求根公式求解

t_{1, 2} = \frac{- 3 \pm 3 ^{2} - 4 ( - 1 ) \cdot 27}{2 ( - 1 )}

3^{2} - 4 (- 1) \cdot 27 = 313

t_{1, 2} = \frac{- 3 \pm 3 13}{2 ( - 1 )}

将解分隔开

t_{1} = \frac{- 3 + 3 13}{2 ( - 1 )}, t_{2} = \frac{- 3 - 3 13}{2 ( - 1 )}

t = \frac{- 3 + 3 13}{2 ( - 1 )} : - \frac{- 3 + 3 13}{2}

t = \frac{- 3 - 3 13}{2 ( - 1 )} : \frac{3 + 3 13}{2}

二次方程组的解是:

t = - \frac{- 3 + 3 13}{2}, t = \frac{3 + 3 13}{2}

作图

流行的例子

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x^{2} + x - 21 = 0

(2 x + 5) (3 x - 2) = 4

x/(5000)= 4/2000 (5-x-0.3)^2

\frac{x}{5000} = \frac{4}{2000} (5 - x - 0.3)^{2}

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