Sr Examen

Otras calculadoras

Suma de la serie (-1)^n((n2^(n+1))/(3^(n+1)))



=

Solución

Ha introducido [src]
  oo               
____               
\   `              
 \            n + 1
  \       n n2     
   )  (-1) *-------
  /           n + 1
 /           3     
/___,              
n = 1              
$$\sum_{n=1}^{\infty} \left(-1\right)^{n} \frac{n_{2}^{n + 1}}{3^{n + 1}}$$
Sum((-1)^n*(n2^(n + 1)/3^(n + 1)), (n, 1, oo))
Respuesta [src]
   //       -n2               |n2|    \
   ||    ----------       for ---- < 1|
   ||      /    n2\            3      |
   ||    3*|1 + --|                   |
   ||      \    3 /                   |
   ||                                 |
n2*|<  oo                             |
   || ___                             |
   || \  `                            |
   ||  \       n  -n   n              |
   ||  /   (-1) *3  *n2    otherwise  |
   || /__,                            |
   \\n = 1                            /
---------------------------------------
                   3                   
$$\frac{n_{2} \left(\begin{cases} - \frac{n_{2}}{3 \left(\frac{n_{2}}{3} + 1\right)} & \text{for}\: \frac{\left|{n_{2}}\right|}{3} < 1 \\\sum_{n=1}^{\infty} \left(-1\right)^{n} 3^{- n} n_{2}^{n} & \text{otherwise} \end{cases}\right)}{3}$$
n2*Piecewise((-n2/(3*(1 + n2/3)), |n2|/3 < 1), (Sum((-1)^n*3^(-n)*n2^n, (n, 1, oo)), True))/3

    Ejemplos de hallazgo de la suma de la serie