Re: How to get Mathematica to actually *add* fractions?
- To: mathgroup at smc.vnet.net
- Subject: [mg40559] Re: How to get Mathematica to actually *add* fractions?
- From: adam.smith at hillsdale.edu (Adam Smith)
- Date: Thu, 10 Apr 2003 03:37:33 -0400 (EDT)
- References: <b70ck5$8al$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Use the command Together[] thing = (2/(3x)) + (6/x) + (x/(x + 3)) Out[1]= 20/(3*x) + x/(3 + x) In[2]:= Together[thing] Out[2]= (60 + 20*x + 3*x^2)/(3*x*(3 + x)) Together can be a powerful tool when trying to obtain a specific form of the result. Just be aware that it is sometimes very time consuming (if not nearly impossible) to get Mathematica to return a final form that exactly matches some desired form (say that is quoted in a text). Adam Smith a_cjones at hotmail.com (cdj) wrote in message news:<b70ck5$8al$1 at smc.vnet.net>... > Hi, > > Like the subject says, but take for example: > > (2/(3x)) + (6/x) + (x/(x + 3)) > > Sending to the kernel simply gives: > > 20/3x + x/(3+x) > > What I wanted/hoped for was the common-denominator version: > > (3x^2 + 20x + 60)/(3x(x+3)) > > Is there any way to get Mathematica to give the one-denominator > version of sums of fractions? > > thanks, > > cdj