1-0,4^x*0.7^x*0.9^x=0,01 la ecuación
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Solución
Solución detallada
Tenemos la ecuación:
$$- \left(\frac{9}{10}\right)^{x} \left(\frac{2}{5}\right)^{x} \left(\frac{7}{10}\right)^{x} + 1 = \frac{1}{100}$$
o
$$\left(- \left(\frac{9}{10}\right)^{x} \left(\frac{2}{5}\right)^{x} \left(\frac{7}{10}\right)^{x} + 1\right) - \frac{1}{100} = 0$$
o
$$- \left(\frac{63}{250}\right)^{x} = - \frac{99}{100}$$
o
$$\left(\frac{63}{250}\right)^{x} = \frac{99}{100}$$
- es la ecuación exponencial más simple
Sustituimos
$$v = \left(\frac{63}{250}\right)^{x}$$
obtendremos
$$v - \frac{99}{100} = 0$$
o
$$v - \frac{99}{100} = 0$$
Transportamos los términos libres (sin v)
del miembro izquierdo al derecho, obtenemos:
$$v = \frac{99}{100}$$
Obtenemos la respuesta: v = 99/100
hacemos cambio inverso
$$\left(\frac{63}{250}\right)^{x} = v$$
o
$$x = \frac{\log{\left(v \right)}}{\log{\left(\frac{63}{250} \right)}}$$
Entonces la respuesta definitiva es
$$x_{1} = \frac{\log{\left(\frac{99}{100} \right)}}{\log{\left(\frac{63}{250} \right)}} = \log{\left(\left(\frac{99}{100}\right)^{\frac{1}{\log{\left(\frac{63}{250} \right)}}} \right)}$$
/ 1 \
| --------|
| /250\|
| log|---||
| \ 63/|
|/100\ |
x1 = log||---| |
\\ 99/ /
$$x_{1} = \log{\left(\left(\frac{100}{99}\right)^{\frac{1}{\log{\left(\frac{250}{63} \right)}}} \right)}$$
x1 = log((100/99)^(1/log(250/63)))
Suma y producto de raíces
[src]
/ 1 \
| --------|
| /250\|
| log|---||
| \ 63/|
|/100\ |
log||---| |
\\ 99/ /
$$\log{\left(\left(\frac{100}{99}\right)^{\frac{1}{\log{\left(\frac{250}{63} \right)}}} \right)}$$
/ 1 \
| --------|
| /250\|
| log|---||
| \ 63/|
|/100\ |
log||---| |
\\ 99/ /
$$\log{\left(\left(\frac{100}{99}\right)^{\frac{1}{\log{\left(\frac{250}{63} \right)}}} \right)}$$
/ 1 \
| --------|
| /250\|
| log|---||
| \ 63/|
|/100\ |
log||---| |
\\ 99/ /
$$\log{\left(\left(\frac{100}{99}\right)^{\frac{1}{\log{\left(\frac{250}{63} \right)}}} \right)}$$
/ 1 \
| --------|
| /250\|
| log|---||
| \ 63/|
|/100\ |
log||---| |
\\ 99/ /
$$\log{\left(\left(\frac{100}{99}\right)^{\frac{1}{\log{\left(\frac{250}{63} \right)}}} \right)}$$
log((100/99)^(1/log(250/63)))