CAS

[Joe Horn]

If you're talking about the HP 50g, try the FDIST (Fully Distribute) command, which is in the CONVERT REWRITE menu. It sprinkles some unnecessary coefficients of 1 in there, but otherwise it yields the result you're looking for.

If you're talking about the Prime, the simplify() command in its CAS yields what you want, with the terms in standard descending alphabetical order.