Just dumping it here - Printable Version

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Just dumping it here - Macluawn - 09.12.2011

x=0.(9)
10x = 9.(9)
10x-x = 9.(9) - 0.(9)
9x = 9
x = 1 = 0.(9)

le probleme, math people?

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Re: Just dumping it here - Ash. - 09.12.2011

I confused a math teacher by doing that - it was quite funny because I proved him wrong, after about a 30 minute debate about that!

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Re: Just dumping it here - [MM]IKKE - 09.12.2011

What's this supposed to mean? If you want to prove it wrong, look at step 2: 10x = 9.9? If you define x as 0.9, then that's 9.0...

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Re: Just dumping it here - Macluawn - 09.12.2011

0.(9) = 0.999999999999...
it just means, that the number nine is repeating forever.

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Re: Just dumping it here - Mauzen - 09.12.2011

Ye good ol' problem, also was a popular topic during my physics lessons back at school.
0.(9) is indeed = 1, there are a lot of ways to proof that. I really like your solution, havent seen it that way before I think. However, thats the most simple one that comes up to my mind:

edit: +rep for a math topic finally

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Re: Just dumping it here - [MM]IKKE - 09.12.2011

Oh, I know what it means now. Never seen that notation before tbh, we just write 0.99...And yes it's true, countless ways to prove them ( http://en.wikipedia.org/wiki/0.999... ), yours is included as well.

I like this one:

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