Summation bug? (HP-49G, 50g)

[Claudio L.]

Apparently, the summation is done in "approx" mode even with the calculator in exact mode, so the exponents of x as well as the constants after the summation are real numbers, then the CAS is unable to simplify x^N/x.
Manually editing the result of SUM to change all reals into integers then EVAL in exact mode will finally get rid of the spurious x in the denominator.

I don't know if SUM is supposed to do this or not, but it's certainly an unexpected behavior, not very user-friendly.

Claudio