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Re: How to get Mathematica to actually *add* fractions?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg40539] Re: How to get Mathematica to actually *add* fractions?
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Wed, 9 Apr 2003 20:26:27 -0400 (EDT)
  • Organization: Universitaet Leipzig
  • References: <b70ck5$8al$1@smc.vnet.net>
  • Reply-to: kuska at informatik.uni-leipzig.de
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

?Together

Together[expr] puts terms in a sum over a common denominator, and
cancels \
factors in the result.

Regards
  Jens

cdj wrote:
> 
> 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


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