Nachacat1954 Sorry for the late reply. If you can register your expansions in the EA App, then yes, you'll be able to install them alongside the base game once you buy it. If you can't register your packs, however, the EA App won't let them load into your game even if you are able to technically install them.
In that case, you'd be better off finding another copy of the base game disc. It needs to have been manufactured prior to September 2012, as the newer ones have a mandatory Origin tie-in, which now forces the EA App to be involved. You can check the copyright date on the back of the case, and newer ones should also have the Origin logo on the front.