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

  • To: mathgroup at smc.vnet.net
  • Subject: [mg40549] Re: [mg40529] How to get Mathematica to actually *add* fractions?
  • From: Andrzej Kozlowski <akoz at mimuw.edu.pl>
  • Date: Thu, 10 Apr 2003 03:36:28 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

The function's name says it all:

In[1]:=
Together[2/(3*x) + 6/x + x/(x + 3)]

Out[1]=
(60 + 20*x + 3*x^2)/(3*x*(3 + x))



On Wednesday, April 9, 2003, at 02:33  pm, 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
>
>
>
Andrzej Kozlowski
Yokohama, Japan
http://www.mimuw.edu.pl/~akoz/
http://platon.c.u-tokyo.ac.jp/andrzej/



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