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  • Desigualdades:
  • (x+3)*(x-7)>0 (x+3)*(x-7)>0
  • 5x-3(5x-8)<-7 5x-3(5x-8)<-7
  • (x-5)/(x+6)<0 (x-5)/(x+6)<0
  • x+5>0 x+5>0
  • Expresiones idénticas

  • ((log dos (8x)*log0, uno 25x(2))/log0,5x(dieciséis))<=1/ cuatro
  • (( logaritmo de 2(8x) multiplicar por logaritmo de 0,125x(2)) dividir por logaritmo de 0,5x(16)) menos o igual a 1 dividir por 4
  • (( logaritmo de dos (8x) multiplicar por logaritmo de 0, uno 25x(2)) dividir por logaritmo de 0,5x(dieciséis)) menos o igual a 1 dividir por cuatro
  • ((log2(8x)log0,125x(2))/log0,5x(16))<=1/4
  • log28xlog0,125x2/log0,5x16<=1/4
  • ((log2(8x)*log0,125x(2)) dividir por log0,5x(16))<=1 dividir por 4

((log2(8x)*log0,125x(2))/log0,5x(16))<=1/4 desigualdades

En la desigualdad la incógnita

Solución

Ha introducido [src]
log(8*x)                         
--------*log(0.125*x)*2          
 log(2)                          
-----------------------*16 <= 1/4
       log(0.5*x)                
$$16 \frac{2 \frac{\log{\left(8 x \right)}}{\log{\left(2 \right)}} \log{\left(0.125 x \right)}}{\log{\left(0.5 x \right)}} \leq \frac{1}{4}$$
16*((2*((log(8*x)/log(2))*log(0.125*x)))/log(0.5*x)) <= 1/4
Solución detallada
Se da la desigualdad:
$$16 \frac{2 \frac{\log{\left(8 x \right)}}{\log{\left(2 \right)}} \log{\left(0.125 x \right)}}{\log{\left(0.5 x \right)}} \leq \frac{1}{4}$$
Para resolver esta desigualdad primero hay que resolver la ecuación correspondiente:
$$16 \frac{2 \frac{\log{\left(8 x \right)}}{\log{\left(2 \right)}} \log{\left(0.125 x \right)}}{\log{\left(0.5 x \right)}} = \frac{1}{4}$$
Resolvemos:
$$x_{1} = 0.125451886590722$$
$$x_{2} = 8.01446617054832$$
$$x_{1} = 0.125451886590722$$
$$x_{2} = 8.01446617054832$$
Las raíces dadas
$$x_{1} = 0.125451886590722$$
$$x_{2} = 8.01446617054832$$
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
$$x_{0} = x_{1} - \frac{1}{10}$$
=
$$- \frac{1}{10} + 0.125451886590722$$
=
$$0.0254518865907216$$
lo sustituimos en la expresión
$$16 \frac{2 \frac{\log{\left(8 x \right)}}{\log{\left(2 \right)}} \log{\left(0.125 x \right)}}{\log{\left(0.5 x \right)}} \leq \frac{1}{4}$$
$$16 \frac{2 \frac{\log{\left(0.0254518865907216 \cdot 8 \right)}}{\log{\left(2 \right)}} \log{\left(0.0254518865907216 \cdot 0.125 \right)}}{\log{\left(0.0254518865907216 \cdot 0.5 \right)}} \leq \frac{1}{4}$$
-67.1066823195578       
----------------- <= 1/4
      log(2)            

significa que una de las soluciones de nuestra ecuación será con:
$$x \leq 0.125451886590722$$
 _____           _____          
      \         /
-------•-------•-------
       x1      x2

Recibiremos otras soluciones de la desigualdad pasando al polo siguiente etc.
etc.
Respuesta:
$$x \leq 0.125451886590722$$
$$x \geq 8.01446617054832$$
Solución de la desigualdad en el gráfico
Respuesta rápida [src]
  /   /                                           ____________________________________________________________       \     /                                          ____________________________________________________________         \\
  |   |                                          /                                                       2           |     |                                         /                                                       2             ||
  |   |                      -1.76688141047831*\/  0.346273006073312 + 1.0*log(2) + 0.716973021645169*log (2)        |     |                      1.76688141047831*\/  0.346273006073312 + 1.0*log(2) + 0.716973021645169*log (2)          ||
Or\And\x <= 1.0027112750502*e                                                                                 , 0 < x/, And\x <= 1.0027112750502*e                                                                                , 2.0 < x//
$$\left(x \leq \frac{1.0027112750502}{e^{1.76688141047831 \sqrt{0.716973021645169 \log{\left(2 \right)}^{2} + 0.346273006073312 + 1.0 \log{\left(2 \right)}}}} \wedge 0 < x\right) \vee \left(x \leq 1.0027112750502 e^{1.76688141047831 \sqrt{0.716973021645169 \log{\left(2 \right)}^{2} + 0.346273006073312 + 1.0 \log{\left(2 \right)}}} \wedge 2.0 < x\right)$$
((0 < x)∧(x <= 1.0027112750502*exp(-1.76688141047831*sqrt(0.346273006073312 + 1.0*log(2) + 0.716973021645169*log(2)^2))))∨((2.0 < x)∧(x <= 1.0027112750502*exp(1.76688141047831*sqrt(0.346273006073312 + 1.0*log(2) + 0.716973021645169*log(2)^2))))
Respuesta rápida 2 [src]
                                          ____________________________________________________________                                               ____________________________________________________________ 
                                         /                                                       2                                                  /                                                       2     
                     -1.76688141047831*\/  0.346273006073312 + 1.0*log(2) + 0.716973021645169*log (2)                            1.76688141047831*\/  0.346273006073312 + 1.0*log(2) + 0.716973021645169*log (2)  
(0, 1.0027112750502*e                                                                                 ] U (2.0, 1.0027112750502*e                                                                                ]
$$x\ in\ \left(0, \frac{1.0027112750502}{e^{1.76688141047831 \sqrt{0.716973021645169 \log{\left(2 \right)}^{2} + 0.346273006073312 + 1.0 \log{\left(2 \right)}}}}\right] \cup \left(2.0, 1.0027112750502 e^{1.76688141047831 \sqrt{0.716973021645169 \log{\left(2 \right)}^{2} + 0.346273006073312 + 1.0 \log{\left(2 \right)}}}\right]$$
x in Union(Interval.Lopen(0, 1.0027112750502*exp(-1.76688141047831*sqrt(0.716973021645169*log(2)^2 + 0.346273006073312 + 1.0*log(2)))), Interval.Lopen(2.00000000000000, 1.0027112750502*exp(1.76688141047831*sqrt(0.716973021645169*log(2)^2 + 0.346273006073312 + 1.0*log(2)))))