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(x*1/9)^log(x)/log(3)<=1 desigualdades

En la desigualdad la incógnita

Solución

Ha introducido [src]
   log(x)     
/x\           
|-|           
\9/           
--------- <= 1
  log(3)      
$$\frac{\left(\frac{x}{9}\right)^{\log{\left(x \right)}}}{\log{\left(3 \right)}} \leq 1$$
(x/9)^log(x)/log(3) <= 1
Solución detallada
Se da la desigualdad:
$$\frac{\left(\frac{x}{9}\right)^{\log{\left(x \right)}}}{\log{\left(3 \right)}} \leq 1$$
Para resolver esta desigualdad primero hay que resolver la ecuación correspondiente:
$$\frac{\left(\frac{x}{9}\right)^{\log{\left(x \right)}}}{\log{\left(3 \right)}} = 1$$
Resolvemos:
$$x_{1} = \frac{3}{e^{\sqrt{\log{\left(\log{\left(3 \right)} \right)} + \log{\left(3 \right)}^{2}}}}$$
$$x_{2} = 3 e^{\sqrt{\log{\left(\log{\left(3 \right)} \right)} + \log{\left(3 \right)}^{2}}}$$
$$x_{1} = \frac{3}{e^{\sqrt{\log{\left(\log{\left(3 \right)} \right)} + \log{\left(3 \right)}^{2}}}}$$
$$x_{2} = 3 e^{\sqrt{\log{\left(\log{\left(3 \right)} \right)} + \log{\left(3 \right)}^{2}}}$$
Las raíces dadas
$$x_{1} = \frac{3}{e^{\sqrt{\log{\left(\log{\left(3 \right)} \right)} + \log{\left(3 \right)}^{2}}}}$$
$$x_{2} = 3 e^{\sqrt{\log{\left(\log{\left(3 \right)} \right)} + \log{\left(3 \right)}^{2}}}$$
son puntos de cambio del signo de desigualdad en las soluciones.
Primero definámonos con el signo hasta el punto extremo izquierdo:
$$x_{0} \leq x_{1}$$
Consideremos, por ejemplo, el punto
$$x_{0} = x_{1} - \frac{1}{10}$$
=
$$- \frac{1}{10} + \frac{3}{\left(e^{1}\right)^{\sqrt{\log{\left(\log{\left(3 \right)} \right)} + \log{\left(3 \right)}^{2}}}}$$
=
$$- \frac{1}{10} + \frac{3}{e^{\sqrt{\log{\left(\log{\left(3 \right)} \right)} + \log{\left(3 \right)}^{2}}}}$$
lo sustituimos en la expresión
$$\frac{\left(\frac{x}{9}\right)^{\log{\left(x \right)}}}{\log{\left(3 \right)}} \leq 1$$
$$\frac{\left(\frac{- \frac{1}{10} + \frac{3}{\left(e^{1}\right)^{\sqrt{\log{\left(\log{\left(3 \right)} \right)} + \log{\left(3 \right)}^{2}}}}}{9}\right)^{\log{\left(- \frac{1}{10} + \frac{3}{\left(e^{1}\right)^{\sqrt{\log{\left(\log{\left(3 \right)} \right)} + \log{\left(3 \right)}^{2}}}} \right)}}}{\log{\left(3 \right)}} \leq 1$$
                                        /              _______________________\     
                                        |             /    2                  |     
                                        |  1       -\/  log (3) + log(log(3)) |     
                                     log|- -- + 3*e                           |     
                                        \  10                                 /     
/            _______________________\                                               
|           /    2                  |                                           <= 1
|        -\/  log (3) + log(log(3)) |                                               
|  1    e                           |                                               
|- -- + ----------------------------|                                               
\  90                3              /                                               
-------------------------------------------------------------------------------     
                                     log(3)                                         

pero
                                        /              _______________________\     
                                        |             /    2                  |     
                                        |  1       -\/  log (3) + log(log(3)) |     
                                     log|- -- + 3*e                           |     
                                        \  10                                 /     
/            _______________________\                                               
|           /    2                  |                                           >= 1
|        -\/  log (3) + log(log(3)) |                                               
|  1    e                           |                                               
|- -- + ----------------------------|                                               
\  90                3              /                                               
-------------------------------------------------------------------------------     
                                     log(3)                                         

Entonces
$$x \leq \frac{3}{e^{\sqrt{\log{\left(\log{\left(3 \right)} \right)} + \log{\left(3 \right)}^{2}}}}$$
no se cumple
significa que una de las soluciones de nuestra ecuación será con:
$$x \geq \frac{3}{e^{\sqrt{\log{\left(\log{\left(3 \right)} \right)} + \log{\left(3 \right)}^{2}}}} \wedge x \leq 3 e^{\sqrt{\log{\left(\log{\left(3 \right)} \right)} + \log{\left(3 \right)}^{2}}}$$
         _____  
        /     \  
-------•-------•-------
       x1      x2
Solución de la desigualdad en el gráfico