$$\frac{1}{\log_x yz + 1} + \frac{1}{\log_y xz + 1} + \frac{1}{\log_z xy + 1}$$ = ?
The equation becomes
==>$$\frac{1}{\log_x yz + log_x x} + \frac{1}{\log_y xz + log_y y} + \frac{1}{\log_z xy + log_z z}$$
$$\frac{1}{\log_x xyz} + \frac{1}{\log_y xyz} + \frac{1}{\log_z xyz}$$
$$log_{xyz} xyz$$
=1.
Create a FREE account and get: