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09-7-2008, 08:29 PM | #1 |
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For those as smart as Devonin, or those who think they are, prove yourselves!
So, I went to my AP physics class today and the teacher asked us a question, and he wanted our answer to be JUSTIFIED by us with specific evidence, here was the question:
Does 1 = .999...(repeating), literally as it is I and two other people got this right out of thirty, so I want to see how many here can get it right, ready, go! EDIT: The underscore didn't go in the right place so I had to fix it, it's .999...forever Last edited by Cerulean Angel; 09-7-2008 at 08:34 PM.. |
09-7-2008, 08:34 PM | #2 |
sonder
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Re: For those as smart as Devonin, or those who think they are, prove yourselves!
Well 1/3 = .333.
2/3 = .666. and 3/3 = .999. But 3/3 is 1. So technically it does ...
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09-7-2008, 08:35 PM | #3 |
I V vi iii IV I IV V
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Re: For those as smart as Devonin, or those who think they are, prove yourselves!
I assume you mean .999 repeating (your repeating sign is somehow over the "D" in "Does")
I'm not that great at math, but my friend is. bringst3hgrind (9:28:10 PM): ok bringst3hgrind (9:28:11 PM): um bringst3hgrind (9:28:12 PM): let bringst3hgrind (9:28:19 PM): x = .999999 repeating bringst3hgrind (9:28:31 PM): so bringst3hgrind (9:28:43 PM): 10x = 9.999999999999999999 bringst3hgrind (9:28:56 PM): subtract x from both sides bringst3hgrind (9:29:01 PM): 9x = 9 bringst3hgrind (9:29:04 PM): x = 1 Edit: ninja'd |
09-7-2008, 08:36 PM | #4 |
Banned
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Posts: 3
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Re: For those as smart as Devonin, or those who think they are, prove yourselves!
waiting for more before I give out the answer, and there's more than one justification, I'm looking more for an algebraic formula or something, but that was a good way of putting it
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09-7-2008, 08:37 PM | #5 | |
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Re: For those as smart as Devonin, or those who think they are, prove yourselves!
Quote:
The other way is true, but my teacher wanted a more solid answer |
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09-7-2008, 08:37 PM | #6 |
Retired BOSS
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Re: For those as smart as Devonin, or those who think they are, prove yourselves!
1. ban evasion, so banned.
2. .999 does NOT equal 1. but .999... (Repeating) DOES equal 1. proofs: proof a: proof b: proof c: there are more... http://en.wikipedia.org/wiki/0.999... edit: 3. this is a retardedly easy and basic and well known problem to be given out in an AP Physics class.
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RIP Last edited by Tasselfoot; 09-7-2008 at 08:40 PM.. |
09-7-2008, 09:24 PM | #7 |
<<Insert Title Here>>
Join Date: Sep 2004
Location: Regina, SK, Canada
Age: 34
Posts: 1,436
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Re: For those as smart as Devonin, or those who think they are, prove yourselves!
I also wonder what relevance this holds to Physics. I think it would be better suited to a Math class.
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09-7-2008, 09:42 PM | #8 |
Very Grave Indeed
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Re: For those as smart as Devonin, or those who think they are, prove yourselves!
I'm not good at math, why does this thread title have anything to do with me?
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09-7-2008, 09:56 PM | #9 |
let it snow~
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Re: For those as smart as Devonin, or those who think they are, prove yourselves!
People think you're smart.
Logically, it doesn't. Mathematically, it does. It makes logical people like me hate mathematical people like Tass. This and that stupid Monty Hall problem. |
09-7-2008, 11:08 PM | #10 |
Very Grave Indeed
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Re: For those as smart as Devonin, or those who think they are, prove yourselves!
Monty Hall makes sense to me now.
So does the comparative size of infinities, but that one took a lot of explaining. A lot of things which are 'true' in math are highly counterintuitive to non-mathematicians. |
09-8-2008, 01:11 AM | #11 |
Retired BOSS
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Re: For those as smart as Devonin, or those who think they are, prove yourselves!
I love the Monty Hall problem.
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