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- Xref: sparky sci.math:11082 rec.puzzles:6055 comp.theory:1883
- Path: sparky!uunet!zaphod.mps.ohio-state.edu!moe.ksu.ksu.edu!matt.ksu.ksu.edu!news
- From: kodiak@matt.ksu.ksu.edu (Bryan D. Nehl)
- Newsgroups: sci.math,rec.puzzles,comp.theory
- Subject: Re: more on 9.999... = 10.0
- Date: 7 Sep 1992 13:13:24 -0500
- Organization: Kansas State University
- Lines: 31
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-
- From an email, I thought might be of interest to others.
-
- > I am familiar with why .999... = 1, and that other such infinite
- > series are equivalent to finite decimals, but how can one tell, when
- > one has a infinitely repeating rational number, whether or not it can
- > be reduced?
-
- You pretty much use the same method as I posted. For example:
-
- x = 1.523523...
- 1000x = 1523.523... ( need to "move out" one group of the
- repeating digits. )
- 1000x-x = 1522
- 999x = 1522
- x = 1522/999
-
- I found all of the methods I posted with (except the series of course)
- in a textbook Called "College Algebra: A Problem Solving Approach," by
- Fleming and Varberg. It is published by Prentice Hall. It's ISBN
- number is 0-13-141656-1. The congressional call number is:
- QA154.2.F53 1988,512.9-dc19.
-
- Hope that helps.
-
- Bryan.
-
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