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受欢迎的代数 >

0=-16t^2+69t+9

解答

0 = - 16 t^{2} + 69 t + 9

解答

t = - \frac{- 69 + 3 593}{32}, t = \frac{69 + 3 593}{32}

+1

十进制

t = - 0.12671 \dots, t = 4.43921 \dots

求解步骤

0 = - 16 t^{2} + 69 t + 9

交换两边

- 16 t^{2} + 69 t + 9 = 0

使用求根公式求解

t_{1, 2} = \frac{- 69 \pm 6 9 ^{2} - 4 ( - 16 ) \cdot 9}{2 ( - 16 )}

6 9^{2} - 4 (- 16) \cdot 9 = 3593

t_{1, 2} = \frac{- 69 \pm 3 593}{2 ( - 16 )}

将解分隔开

t_{1} = \frac{- 69 + 3 593}{2 ( - 16 )}, t_{2} = \frac{- 69 - 3 593}{2 ( - 16 )}

t = \frac{- 69 + 3 593}{2 ( - 16 )} : - \frac{- 69 + 3 593}{32}

t = \frac{- 69 - 3 593}{2 ( - 16 )} : \frac{69 + 3 593}{32}

二次方程组的解是:

t = - \frac{- 69 + 3 593}{32}, t = \frac{69 + 3 593}{32}

作图

流行的例子

化简 (8!)/(3!5!)

s im pl i f y \frac{8 !}{3 ! 5 !}

4 m^{2} + m + 6 = 2

(-26-x)(-44-x)-40*40=0

(- 26 - x) (- 44 - x) - 40 \cdot 40 = 0

因式分解 x^5-6x^4-12x^3+82x^2-45x+300

f a c t or x^{5} - 6 x^{4} - 12 x^{3} + 82 x^{2} - 45 x + 300

\frac{∣ m ∣}{5} = 3