The help has no information about associativity and precedence of operators. This leads to confusion. Example: The formula =-3^2 in Calc can be interpreted as =(-3)^2 as in ODF or OOXML standard or as =0-(3^2) as in common school mathematic and in Writer. This leads to problems for the user. See e.g. bug 37271 and its duplicates.
Request: Add a section about associativity and precedence of operators as they are defined in the standard for Calc formulas. And add a section with examples how to write formulas, to get the behavior known from common school mathematics. And add a section with examples to show the different syntax in Writer.
Olivier Hallot committed a patch related to this issue.
It has been pushed to "master":
tdf#114930 Clarify associativity and precedence of operators to the help