Fredil
Joined : 24 Feb 2008
Posts : 11
|  Subject: Interesting math proof  Sun Mar 02, 2008 2:23 pm | |
| This proves that 0.999... (infinite 9s) equals 1.
x = 0.9999...
10x = 9.9999...
9x = 9
(9x)/9 = 9/9
x = 1 |
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Uber1337
Admin
Joined : 21 Feb 2008
Posts : 106
| | Subject: Re: Interesting math proof Tue Mar 04, 2008 9:51 pm | |
| | 9x doesn't equal 9.... |
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Fredil
Joined : 24 Feb 2008
Posts : 11
| | Subject: Re: Interesting math proof Wed Mar 05, 2008 2:05 pm | |
| Yes it does. Why doesn't it?
9.999... - 0.999... = 9 |
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Fredil
Joined : 24 Feb 2008
Posts : 11
| | Subject: Re: Interesting math proof Wed Mar 05, 2008 2:08 pm | |
| | And if it doesn't equal 9, what DOES it equal? |
|
Person
Joined : 22 Feb 2008
Posts : 34
| | Subject: Re: Interesting math proof Sat Mar 22, 2008 5:07 pm | |
| 9.9999999....-0.999999... doesn't equal 9 x 0.999999999
Plus there was no point in saying x=0.9999999 in your equation because you never incorporated it in 9x=9; you just solved for x. What was the point of saying 10x= 9.999999? |
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Fredil
Joined : 24 Feb 2008
Posts : 11
| | Subject: Re: Interesting math proof Sat Mar 22, 2008 5:20 pm | |
| To show you that it works, or else you'd say that 9x = 89999...1 or something. But if you won't take this, then there's another way.
1/3 = 0.3333...
0.3333...*3 = 0.9999....
(1/3)*3 = 1
By the transitive property, then, 0.9999... = 1. |
|
Person
Joined : 22 Feb 2008
Posts : 34
| | Subject: Re: Interesting math proof Wed Apr 09, 2008 6:28 pm | |
| | Umm...9x does equal 8.99999...1. Sure 10x=9.99999 but that has nothing to do with 9x. Plus, 0.3333 doesn't equal 1/3; it's close, but it's ever so slightly off, as is 0.99999... so substituting 0.333333... with 1/3 is also an entirely different, although similar. equation. Just because 1/3*3=1 doesn't mean that 0.3333...*3=1. |
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daniELCgangsta
Age : 13
Joined : 19 Apr 2008
Posts : 21
Location : in da gangsta hiz house
| | Subject: Re: Interesting math proof Thu May 15, 2008 6:39 pm | |
| okay andrew
_________________
Danielle is so much gangsta than Lankesh... and yo mama...i think i may be in....trouble |
|
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