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受欢迎的代数 >

-5p^2-40p=64

解答

- 5 p^{2} - 40 p = 64

解答

p = - \frac{4 ( 5 + 5 )}{5}, p = - \frac{4 ( 5 - 5 )}{5}

+1

十进制

p = - 5.78885 \dots, p = - 2.21114 \dots

求解步骤

- 5 p^{2} - 40 p = 64

将

64

para o lado esquerdo

- 5 p^{2} - 40 p - 64 = 0

使用求根公式求解

p_{1, 2} = \frac{- ( - 40 ) \pm ( - 40 ) ^{2} - 4 ( - 5 ) ( - 64 )}{2 ( - 5 )}

(- 40)^{2} - 4 (- 5) (- 64) = 85

p_{1, 2} = \frac{- ( - 40 ) \pm 8 5}{2 ( - 5 )}

将解分隔开

p_{1} = \frac{- ( - 40 ) + 8 5}{2 ( - 5 )}, p_{2} = \frac{- ( - 40 ) - 8 5}{2 ( - 5 )}

p = \frac{- ( - 40 ) + 8 5}{2 ( - 5 )} : - \frac{4 ( 5 + 5 )}{5}

p = \frac{- ( - 40 ) - 8 5}{2 ( - 5 )} : - \frac{4 ( 5 - 5 )}{5}

二次方程组的解是:

p = - \frac{4 ( 5 + 5 )}{5}, p = - \frac{4 ( 5 - 5 )}{5}

作图

流行的例子

x=(7.1(80))/(100-(80))

x = \frac{7.1 ( 80 )}{100 - ( 80 )}

2 x^{2} = 3 - x

因式分解 20+5m+12n+3mn

f a c t or 20 + 5 m + 12 n + 3 mn

(x-3)/(x+2)<= 0

\frac{x - 3}{x + 2} \leq 0

\frac{k}{5} < - 4