Games from those 3 countries will most likely be of the Asian region, which is Region 3.
And yes, they'll work perfectly on your PS3, but please be mindful that DLC might be region locked, as well as online play, which is purely up to the devs.
06/08/2008
Melbourne, VIC - I currently own 109 Japanese (Region 2) SONY PLAYSTATION 3 BD games and 14 Australian (Region 4) SONY PLAYSTATION 3 BD games...TOTAL = 123