(1/6)^x+1=36^x-1 уравнение
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Решение
Подробное решение
Дано уравнение:
$$1 + \left(\frac{1}{6}\right)^{x} = 36^{x} - 1$$
или
$$\left(1 + \left(\frac{1}{6}\right)^{x}\right) - \left(36^{x} - 1\right) = 0$$
Сделаем замену
$$v = \left(\frac{1}{6}\right)^{x}$$
получим
$$v + 2 - \frac{1}{v^{2}} = 0$$
или
$$v + 2 - \frac{1}{v^{2}} = 0$$
делаем обратную замену
$$\left(\frac{1}{6}\right)^{x} = v$$
или
$$x = - \frac{\log{\left(v \right)}}{\log{\left(6 \right)}}$$
Тогда, окончательный ответ
$$x_{1} = \frac{\log{\left(\frac{- \log{\left(2 \right)} + \log{\left(1 + \sqrt{5} \right)}}{\log{\left(6 \right)}} \right)}}{\log{\left(\frac{1}{6} \right)}} = \frac{\log{\left(\log{\left(6 \right)} \right)} - \log{\left(- \log{\left(2 \right)} + \log{\left(1 + \sqrt{5} \right)} \right)}}{\log{\left(6 \right)}}$$
$$x_{2} = \frac{\log{\left(\frac{\log{\left(- \frac{1}{2} + \frac{\sqrt{5}}{2} \right)} + i \pi}{\log{\left(6 \right)}} \right)}}{\log{\left(\frac{1}{6} \right)}} = - \frac{\log{\left(\frac{\log{\left(- \frac{1}{2} + \frac{\sqrt{5}}{2} \right)} + i \pi}{\log{\left(6 \right)}} \right)}}{\log{\left(6 \right)}}$$
$$x_{3} = \frac{\log{\left(\frac{i \pi}{\log{\left(6 \right)}} \right)}}{\log{\left(\frac{1}{6} \right)}} = - \frac{\log{\left(\frac{i \pi}{\log{\left(6 \right)}} \right)}}{\log{\left(6 \right)}}$$
/ ___\
-log(2) + log\1 + \/ 5 /
x_1 = ------------------------
log(6)
$$x_{1} = \frac{- \log{\left(2 \right)} + \log{\left(1 + \sqrt{5} \right)}}{\log{\left(6 \right)}}$$
/ ___\
-log(2) + log\-1 + \/ 5 / pi*I
x_2 = ------------------------- + ------
log(6) log(6)
$$x_{2} = \frac{- \log{\left(2 \right)} + \log{\left(-1 + \sqrt{5} \right)}}{\log{\left(6 \right)}} + \frac{i \pi}{\log{\left(6 \right)}}$$
$$x_{3} = \frac{i \pi}{\log{\left(6 \right)}}$$
Сумма и произведение корней
[src]
/ ___\ / ___\
-log(2) + log\1 + \/ 5 / -log(2) + log\-1 + \/ 5 / pi*I pi*I
------------------------ + ------------------------- + ------ + ------
log(6) log(6) log(6) log(6)
$$\left(\frac{- \log{\left(2 \right)} + \log{\left(1 + \sqrt{5} \right)}}{\log{\left(6 \right)}}\right) + \left(\frac{- \log{\left(2 \right)} + \log{\left(-1 + \sqrt{5} \right)}}{\log{\left(6 \right)}} + \frac{i \pi}{\log{\left(6 \right)}}\right) + \left(\frac{i \pi}{\log{\left(6 \right)}}\right)$$
/ ___\ / ___\
-log(2) + log\1 + \/ 5 / -log(2) + log\-1 + \/ 5 / 2*pi*I
------------------------ + ------------------------- + ------
log(6) log(6) log(6)
$$\frac{- \log{\left(2 \right)} + \log{\left(-1 + \sqrt{5} \right)}}{\log{\left(6 \right)}} + \frac{- \log{\left(2 \right)} + \log{\left(1 + \sqrt{5} \right)}}{\log{\left(6 \right)}} + \frac{2 i \pi}{\log{\left(6 \right)}}$$
/ ___\ / ___\
-log(2) + log\1 + \/ 5 / -log(2) + log\-1 + \/ 5 / pi*I pi*I
------------------------ * ------------------------- + ------ * ------
log(6) log(6) log(6) log(6)
$$\left(\frac{- \log{\left(2 \right)} + \log{\left(1 + \sqrt{5} \right)}}{\log{\left(6 \right)}}\right) * \left(\frac{- \log{\left(2 \right)} + \log{\left(-1 + \sqrt{5} \right)}}{\log{\left(6 \right)}} + \frac{i \pi}{\log{\left(6 \right)}}\right) * \left(\frac{i \pi}{\log{\left(6 \right)}}\right)$$
/ pi \
| -------|
| 3 |
| log (6)|
/ / 2 \\ |/ 2 \ |
I*|-pi*I + log|----------||*log||---------| |
| | ___|| || ___| |
\ \-1 + \/ 5 // \\1 + \/ 5 / /
$$i \left(\log{\left(\frac{2}{-1 + \sqrt{5}} \right)} - i \pi\right) \log{\left(\left(\frac{2}{1 + \sqrt{5}}\right)^{\frac{\pi}{\log{\left(6 \right)}^{3}}} \right)}$$
x2 = -0.268569433187884 + 1.75335624426379*i