There are various possible answers to that. One could be the rules of precedence, which determines that calculations in brackets are done first, then exponentiation or powers of, then multiplication and division and finally addition and subtract. BOMDAS and PEDMAS are among the acronyms used for these approaches.
Another answer could be the syntax of functions used in formulas. If functions are not used correctly, they can produce errors. Errors can also occur for many other reasons, if you do things wrong, so there are things you must avoid doing, like dividing by zero or referencing the cell that you are writing a formula in. You can use the Evaluate Formula and other tools to try to resolve these errors.
Right-click and select paste formula
Just hide the Formula Bar.
Excel, which is owned by Microsoft
If you mean doing calculations, then it is a formula.
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83 + 2 = 85 (Excel formula: =83+2)
It can change a total that the formula results in.
Microsoft excel was created by Microsoft
85
Programs->Microsoft Office->Microsoft Excel
Ctrl-comma does not do anything in Excel. Ctrl ' copies from the cell above and Ctrl `switches to and from the formula view.
The equals sign. It must appear at the start of all formulas.