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Suma de la serie (n+1)^7*x^n/n-1



=

Solución

Ha introducido [src]
  oo                   
____                   
\   `                  
 \    /       7  n    \
  \   |(n + 1) *x     |
  /   |----------- - 1|
 /    \     n         /
/___,                  
n = 1                  
$$\sum_{n=1}^{\infty} \left(-1 + \frac{x^{n} \left(n + 1\right)^{7}}{n}\right)$$
Sum(((n + 1)^7*x^n)/n - 1, (n, 1, oo))
Respuesta [src]
                                     //    /     4              3       2\               \      //    x                  \      //     /      3              2\               \      //x*(-1 - x)              \      //      /     2      \                \                                             //    /      5        2        3              4\              \
        //   x                 \     ||  x*\1 + x  + 26*x + 26*x  + 66*x /               |      || --------   for |x| < 1|      ||   x*\-1 - x  - 11*x - 11*x /               |      ||----------   for |x| < 1|      ||    x*\1 + x  + 4*x/                |   //-log(1 - x)  for And(x >= -1, x < 1)\   ||  x*\-1 - x  - 302*x  - 302*x  - 57*x - 57*x /              |
        || -----    for |x| < 1|     ||-------------------------------------  for |x| < 1|      ||        2              |      ||-------------------------------  for |x| < 1|      ||        3               |      ||-----------------------  for |x| < 1|   ||                                    |   ||-----------------------------------------------  for |x| < 1|
        || 1 - x               |     ||       2 /     4            3      2\             |      || (1 - x)               |      ||       2 /      3      2      \             |      ||(-1 + x)                |      ||       2 /     2      \             |   ||   oo                               |   ||       2 /      5       2      4             3\             |
        ||                     |     ||(1 - x) *\1 + x  - 4*x - 4*x  + 6*x /             |      ||                       |      ||(1 - x) *\-1 + x  - 3*x  + 3*x/             |      ||                        |      ||(1 - x) *\1 + x  - 2*x/             |   || ____                               |   ||(1 - x) *\-1 + x  - 10*x  - 5*x  + 5*x + 10*x /             |
        ||  oo                 |     ||                                                  |      ||  oo                   |      ||                                            |      ||  oo                    |      ||                                    |   || \   `                              |   ||                                                            |
-oo + 7*|< ___                 | + 7*|<               oo                                 | + 21*|< ___                   | + 21*|<            oo                              | + 35*|< ___                    | + 35*|<        oo                          | + |<  \     n                           | + |<                    oo                                      |
        || \  `                |     ||              ___                                 |      || \  `                  |      ||           ___                              |      || \  `                   |      ||       ___                          |   ||   \   x                            |   ||                   ___                                      |
        ||  \    n             |     ||              \  `                                |      ||  \      n             |      ||           \  `                             |      ||  \    2  n             |      ||       \  `                         |   ||   /   --           otherwise       |   ||                   \  `                                     |
        ||  /   x    otherwise |     ||               \    5  n                          |      ||  /   n*x    otherwise |      ||            \    4  n                       |      ||  /   n *x    otherwise |      ||        \    3  n                   |   ||  /    n                            |   ||                    \    6  n                               |
        || /__,                |     ||               /   n *x                 otherwise |      || /__,                  |      ||            /   n *x              otherwise |      || /__,                   |      ||        /   n *x          otherwise |   || /___,                              |   ||                    /   n *x                      otherwise |
        \\n = 1                /     ||              /__,                                |      ||n = 1                  |      ||           /__,                             |      ||n = 1                   |      ||       /__,                         |   \\ n = 1                              /   ||                   /__,                                     |
                                     \\             n = 1                                /      \\                       /      \\          n = 1                             /      \\                        /      \\      n = 1                         /                                             \\                  n = 1                                     /
$$21 \left(\begin{cases} \frac{x}{\left(1 - x\right)^{2}} & \text{for}\: \left|{x}\right| < 1 \\\sum_{n=1}^{\infty} n x^{n} & \text{otherwise} \end{cases}\right) + 7 \left(\begin{cases} \frac{x}{1 - x} & \text{for}\: \left|{x}\right| < 1 \\\sum_{n=1}^{\infty} x^{n} & \text{otherwise} \end{cases}\right) + 35 \left(\begin{cases} \frac{x \left(- x - 1\right)}{\left(x - 1\right)^{3}} & \text{for}\: \left|{x}\right| < 1 \\\sum_{n=1}^{\infty} n^{2} x^{n} & \text{otherwise} \end{cases}\right) + 35 \left(\begin{cases} \frac{x \left(x^{2} + 4 x + 1\right)}{\left(1 - x\right)^{2} \left(x^{2} - 2 x + 1\right)} & \text{for}\: \left|{x}\right| < 1 \\\sum_{n=1}^{\infty} n^{3} x^{n} & \text{otherwise} \end{cases}\right) + 21 \left(\begin{cases} \frac{x \left(- x^{3} - 11 x^{2} - 11 x - 1\right)}{\left(1 - x\right)^{2} \left(x^{3} - 3 x^{2} + 3 x - 1\right)} & \text{for}\: \left|{x}\right| < 1 \\\sum_{n=1}^{\infty} n^{4} x^{n} & \text{otherwise} \end{cases}\right) + 7 \left(\begin{cases} \frac{x \left(x^{4} + 26 x^{3} + 66 x^{2} + 26 x + 1\right)}{\left(1 - x\right)^{2} \left(x^{4} - 4 x^{3} + 6 x^{2} - 4 x + 1\right)} & \text{for}\: \left|{x}\right| < 1 \\\sum_{n=1}^{\infty} n^{5} x^{n} & \text{otherwise} \end{cases}\right) + \begin{cases} \frac{x \left(- x^{5} - 57 x^{4} - 302 x^{3} - 302 x^{2} - 57 x - 1\right)}{\left(1 - x\right)^{2} \left(x^{5} - 5 x^{4} + 10 x^{3} - 10 x^{2} + 5 x - 1\right)} & \text{for}\: \left|{x}\right| < 1 \\\sum_{n=1}^{\infty} n^{6} x^{n} & \text{otherwise} \end{cases} + \begin{cases} - \log{\left(1 - x \right)} & \text{for}\: x \geq -1 \wedge x < 1 \\\sum_{n=1}^{\infty} \frac{x^{n}}{n} & \text{otherwise} \end{cases} - \infty$$
-oo + 7*Piecewise((x/(1 - x), |x| < 1), (Sum(x^n, (n, 1, oo)), True)) + 7*Piecewise((x*(1 + x^4 + 26*x + 26*x^3 + 66*x^2)/((1 - x)^2*(1 + x^4 - 4*x - 4*x^3 + 6*x^2)), |x| < 1), (Sum(n^5*x^n, (n, 1, oo)), True)) + 21*Piecewise((x/(1 - x)^2, |x| < 1), (Sum(n*x^n, (n, 1, oo)), True)) + 21*Piecewise((x*(-1 - x^3 - 11*x - 11*x^2)/((1 - x)^2*(-1 + x^3 - 3*x^2 + 3*x)), |x| < 1), (Sum(n^4*x^n, (n, 1, oo)), True)) + 35*Piecewise((x*(-1 - x)/(-1 + x)^3, |x| < 1), (Sum(n^2*x^n, (n, 1, oo)), True)) + 35*Piecewise((x*(1 + x^2 + 4*x)/((1 - x)^2*(1 + x^2 - 2*x)), |x| < 1), (Sum(n^3*x^n, (n, 1, oo)), True)) + Piecewise((-log(1 - x), (x >= -1)∧(x < 1)), (Sum(x^n/n, (n, 1, oo)), True)) + Piecewise((x*(-1 - x^5 - 302*x^2 - 302*x^3 - 57*x - 57*x^4)/((1 - x)^2*(-1 + x^5 - 10*x^2 - 5*x^4 + 5*x + 10*x^3)), |x| < 1), (Sum(n^6*x^n, (n, 1, oo)), True))

    Ejemplos de hallazgo de la suma de la serie