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受欢迎的代数 >

99=-16(t)(t)+80(t)+3

解答

99 = - 16 (t) (t) + 80 (t) + 3

解答

t = 2, t = 3

求解步骤

99 = - 16 (t) (t) + 80 (t) + 3

展开

- 16 (t) (t) + 80 (t) + 3 : - 16 t^{2} + 80 t + 3

99 = - 16 t^{2} + 80 t + 3

交换两边

- 16 t^{2} + 80 t + 3 = 99

将

99

para o lado esquerdo

- 16 t^{2} + 80 t - 96 = 0

使用求根公式求解

t_{1, 2} = \frac{- 80 \pm 8 0 ^{2} - 4 ( - 16 ) ( - 96 )}{2 ( - 16 )}

8 0^{2} - 4 (- 16) (- 96) = 16

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

将解分隔开

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

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

t = \frac{- 80 - 16}{2 ( - 16 )} : 3

二次方程组的解是:

t = 2, t = 3

作图

流行的例子

2 x^{2} - 4 x - 5 = 0

因式分解 10a^4-a^3-21a^2

f a c t or 10 a^{4} - a^{3} - 21 a^{2}

(x-2)^3-x(x-5)*(x-1)=2-3x

(x - 2)^{3} - x (x - 5) \cdot (x - 1) = 2 - 3 x

s im pl i f y (1 + i)^{8}

因式分解 n^3+5n^2-9n-45

f a c t or n^{3} + 5 n^{2} - 9 n - 45