Dynamic formula problem

hi  experts,
my customer requires that:
for example,
for year 2007
field1   field2   field3
A1       B1      =A1+B1
A2       B2      =A2+B2
for year 2008
field1   field2   field3
A1       B1      =A1*B1
A2       B2      =A2*B2
as show above the field3 dynamic change according to the 0calyear
how to do? hunger for ur advice and thanks a lot!

Your formula can look like this:
(A+B)(year == 2007) + (AB)*(year == 2008)
The equality tests evaluate to 1 if true and 0 if false for the query formulas.

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