Cell A must be the average of cells D11 and E11 of the different SUCRIVOIRE-BOROTOU-KORO and SUCRIVOIRE-ZUENOULA sheets.
So within A we have the formula = AVG ({reference of D11}; {reference of E11}).
How to ensure that by copying or duplicating the formula from cell A into cells B and C, on the SUCRIVOIRE sheet, we automatically have the formulas:
= AVG ({reference of D12}; {reference of E12}) for cell B and
= AVG ({reference of D21}; {reference of E21}) for cell C?