Analysis: Cartesian coordinate system can be established. Let (0,0) represent the location of the teaching building and (2,0) the location of the playground and (-2,2) the location of the experimental building, then Xiaohui's dormitory is (2,3).

Answer:

Solution: If (0,0) indicates the location of the teaching building, (2,0) indicates the location of the playground and-2,2 indicates the location of the experimental building, then Xiaohui's dormitory location is (2,3).