2.1.820 Part 1 Section 19.642, table:formula
a. The standard defines the attribute table:formula, contained within the element <table:coveredtablecell>

This attribute is not supported in Word 2013, Word 2016, or Word 2019.
b. The standard defines the attribute table:formula, contained within the element <table:tablecell>

This attribute is not supported in Word 2013, Word 2016, or Word 2019.
c. The standard defines the attribute table:formula, contained within the element <table:coveredtablecell>

This attribute is not supported in Excel 2013, Excel 2016, or Excel 2019.
d. The standard defines the attribute table:formula, contained within the element <table:tablecell>

This attribute is supported in Excel 2013, Excel 2016, and Excel 2019.
When saving the table:formula attribute, Excel precedes the formula string with the "of" namespace.
When saving the table:formula attribute, Excel saves a formula string that follows [ODF1.2] part 2.
When loading the attribute table:formula, Excel first looks at the namespace. If the namespace is 'of' , 'msoxl' or not specified, Excel will attempt to load the value of table:formula as a formula in Excel.
Formulas using the 'of' namespace and those without a namespaces are expected to follow [Oasis ODF 1.2] part 2.
Formulas using the 'msoxl' namespace follow [ISO/IEC295001] section 18.17, except workbooknames are written as literal values instead of tokens given the lack of a relationship part.
When loading the table:formula attribute, if the namespace is unknown, the table:formula attribute is not loaded, and the value "office:value" is used instead. If the result of the formula is an error, Excel loads the <text:p> element and maps the element to an Error data type. Error data types that Excel does not support are mapped to #VALUE!
e. The standard defines the attribute table:formula, contained within the element <table:tablecell>