Custom Calculation

Good afternoon. I would like to see if someone can help me. I want to use the custom calculation editor for my results. I have seen examples of some formulas on the internet, but I don't know how to do them. Are they already established formulas? Is there a pattern to write them? Sorry for so many questions but I can't find any manual that can help me either and I'm totally lost. Thank you very much in advance.

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