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Suma de la serie x^n/((n+2)*5^n)



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Solución

Ha introducido [src]
  oo            
____            
\   `           
 \         n    
  \       x     
   )  ----------
  /            n
 /    (n + 2)*5 
/___,           
n = 1           
$$\sum_{n=1}^{\infty} \frac{x^{n}}{5^{n} \left(n + 2\right)}$$
Sum(x^n/(((n + 2)*5^n)), (n, 1, oo))
Respuesta [src]
/  /      15*x          /    x\\                         
|  |-75 - ----   375*log|1 - -||                         
|  |       2            \    5/|                         
|x*|---------- - --------------|                         
|  |     2              3      |                         
|  \    x              x       /                         
|-------------------------------  for And(x >= -5, x < 5)
|               15                                       
|                                                        
<           oo                                           
|         ____                                           
|         \   `                                          
|          \     -n  n                                   
|           \   5  *x                                    
|           /   ------                   otherwise       
|          /    2 + n                                    
|         /___,                                          
|         n = 1                                          
\                                                        
$$\begin{cases} \frac{x \left(\frac{- \frac{15 x}{2} - 75}{x^{2}} - \frac{375 \log{\left(1 - \frac{x}{5} \right)}}{x^{3}}\right)}{15} & \text{for}\: x \geq -5 \wedge x < 5 \\\sum_{n=1}^{\infty} \frac{5^{- n} x^{n}}{n + 2} & \text{otherwise} \end{cases}$$
Piecewise((x*((-75 - 15*x/2)/x^2 - 375*log(1 - x/5)/x^3)/15, (x >= -5)∧(x < 5)), (Sum(5^(-n)*x^n/(2 + n), (n, 1, oo)), True))

    Ejemplos de hallazgo de la suma de la serie