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MathGroup Archive 2001

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RE: help: rewriting a fraction a/b==c/d + e/f

  • To: mathgroup at smc.vnet.net
  • Subject: [mg31012] RE: [mg31000] help: rewriting a fraction a/b==c/d + e/f
  • From: "David Park" <djmp at earthlink.net>
  • Date: Tue, 2 Oct 2001 01:20:47 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

Okke,

Use Apart.

1/((x - 1)(x^2 + x + 1)) // Apart
1/(3*(-1 + x)) + (-2 - x)/(3*(1 + x + x^2))

If you are new to Mathematica, it will probably be worth your while to work
through as much of Part I of the Mathematica Book as seems relevant to you.

David Park
djmp at earthlink.net
http://home.earthlink.net/~djmp/



> From: Okke [mailto:kroosu at tref.nl]
To: mathgroup at smc.vnet.net
>
> hello,
> i'm trying the mathematica demo by doing some basic mathematics.
> now i'm stuck at rewritting a fraction.
> could somebody please help me by telling  me how to rewrite:
>
> 1/((x-1)(x^2+x+1)) to A/(x-1) + (Bx+C)/(x^2+x+1)
> or do i have to do that manualy?
> and can mathematica find  the values for A, B and C ?
> Solve[eqn1==eq2,{A}] doesnt solve the problem, and subsituting
> x with 1 doesnt either.
>
> tia,
> --
> Okke <kroosu at tref.nl>
>



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