File:Obr5.png

${\displaystyle T=\sum _{i=1}^{n}y_{i}\cdot T_{i}+\sum _{i=1}^{n}y_{i}\cdot ln{\frac {x_{i}}{x}}}$

In your article, replace the image with:

<math>T=\sum_{i=1}^n y_i\cdot T_i + \sum_{i=1}^n y_i \cdot ln \frac{x_i}{x}</math>

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