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Better proof

  1. Jun 29, 2009 #1
    1. The problem statement, all variables and given/known data
    proof (a/b)/(c/d) = (a/b).(c/d)-1 = (a.b-1).(c.d-1)-1 = (a.b-1)(d.c-1)=(a.d).(b-1.c-1) = (a.d).(b.c)-1 = (a.d)/(b.c)

    2. Relevant equations

    3. The attempt at a solution

    the other way to proof (a/b).(c/d)-1 = [(a.b-1)/(c.d-1)].(d/d-1) = (a.d.b-1)/(c.d.d-1) =(a.d.b-1)/c = (a.d)/(b.c)

    which one is better proof ?
  2. jcsd
  3. Jun 29, 2009 #2
    i mean in more elegant way ..oh yea thanx before ..
  4. Jun 29, 2009 #3


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    Gold Member

    you mean d/d:wink:

    all works well, though I prefer the first
  5. Jun 29, 2009 #4
    yea you right ..thanx for correcting:wink:

    mm..you prefer the first ,but i dontnow im suite with the last :biggrin:..
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