Originally posted by observantUAfter trying some 2300 different combinations, this is the answer I've come up with:
Fill in the digits 1 to 9 at the positions marked [] in the following , so as to satisfy the equation.
[]/[][] + []/[][] + []/[][] = 1.
No digit is to be repeated; each digit should be used but once.
For example a/bc would mean a/(10*b+c).
9/12 + 5/34 + 7/68 = 1