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受欢迎的代数 >

38=-16t^2+80t+102

解答

38 = - 16 t^{2} + 80 t + 102

解答

t = - \frac{- 5 + 41}{2}, t = \frac{5 + 41}{2}

+1

十进制

t = - 0.70156 \dots, t = 5.70156 \dots

求解步骤

38 = - 16 t^{2} + 80 t + 102

交换两边

- 16 t^{2} + 80 t + 102 = 38

将

38

para o lado esquerdo

- 16 t^{2} + 80 t + 64 = 0

使用求根公式求解

t_{1, 2} = \frac{- 80 \pm 8 0 ^{2} - 4 ( - 16 ) \cdot 64}{2 ( - 16 )}

8 0^{2} - 4 (- 16) \cdot 64 = 1641

t_{1, 2} = \frac{- 80 \pm 16 41}{2 ( - 16 )}

将解分隔开

t_{1} = \frac{- 80 + 16 41}{2 ( - 16 )}, t_{2} = \frac{- 80 - 16 41}{2 ( - 16 )}

t = \frac{- 80 + 16 41}{2 ( - 16 )} : - \frac{- 5 + 41}{2}

t = \frac{- 80 - 16 41}{2 ( - 16 )} : \frac{5 + 41}{2}

二次方程组的解是:

t = - \frac{- 5 + 41}{2}, t = \frac{5 + 41}{2}

作图

流行的例子

6 - 2 x > - 14

因式分解 4x^3-9xy^2+4x^2y-9y^3

f a c t or 4 x^{3} - 9 x y^{2} + 4 x^{2} y - 9 y^{3}

化简 1/3-7/24

s im pl i f y \frac{1}{3} - \frac{7}{24}

因式分解 30k^3+6k^2

f a c t or 30 k^{3} + 6 k^{2}

h=54sqrt((10000+(-571))/(10000-(-571)))

h = 54 \frac{10000 + ( - 571 )}{10000 - ( - 571 )}