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Mathematical oddities
Posted: Sun Dec 19, 2010 4:09 pm
by jozsefkoma
I posted exactly this post on 3.studio forum but I want show this to other users from this forum
Just look!
13837 * xy * 73=xyxyxyxy
xy is a number between 10 and 99
Example:
13837 *35 * 73=35353535 (35 35 35 35)
Test it on any calculator.
It's work.
Try with another numbers.
Another one:
1 x 8 + 1 = 9
12 x 8 + 2 = 98
123 x 8 + 3 = 987
1234 x 8 + 4 = 9876
12345 x 8 + 5 = 98765
123456 x 8 + 6 = 987654
1234567 x 8 + 7 = 9876543
12345678 x 8 + 8 = 98765432
123456789 x 8 + 9 = 987654321
1 x 9 + 2 = 11
12 x 9 + 3 = 111
123 x 9 + 4 = 1111
1234 x 9 + 5 = 11111
12345 x 9 + 6 = 111111
123456 x 9 + 7 = 1111111
1234567 x 9 + 8 = 11111111
12345678 x 9 + 9 = 111111111
123456789 x 9 +10 = 1111111111
9 x 9 + 7 = 88
98 x 9 + 6 = 888
987 x 9 + 5 = 8888
9876 x 9 + 4 = 88888
98765 x 9 + 3 = 888888
987654 x 9 + 2 = 8888888
9876543 x 9 + 1 = 88888888
98765432 x 9 + 0 = 888888888
1 x 1 = 1
11 x 11 = 121
111 x 111 = 12321
1111 x 1111 = 1234321
11111 x 11111 = 123454321
111111 x 111111 = 12345654321
1111111 x 1111111 = 1234567654321
11111111 x 11111111=123456787654321
111111111 x 111111111 = 12345678987654321
Posted: Sun Dec 19, 2010 4:12 pm
by Technos72
That's real interesting

. I like math. Can't wait for it next semester at school!
Posted: Sun Dec 19, 2010 4:57 pm
by StinkerSquad01
xyzxyz/7/11/13=xyz
It works with any 3-digit number repeted once.

Posted: Sun Dec 19, 2010 7:05 pm
by boywhoflies
WOW thats cool!

Posted: Sun Dec 19, 2010 8:48 pm
by ben-09
Thats some interesting maths.
Posted: Sun Dec 19, 2010 11:32 pm
by ~xpr'd~
Awesome.
Unneeded poll though. Seriously, there's way too many.
Posted: Sun Dec 19, 2010 11:45 pm
by MyNameIsKooky
~xpr'd~ wrote:Awesome.
Unneeded poll though. Seriously, there's way too many.
Too many? Like, only 1/8 of the topics in this area are polls.
Posted: Sun Dec 19, 2010 11:56 pm
by Qloof234
MyNameIsKooky wrote:~xpr'd~ wrote:Awesome.
Unneeded poll though. Seriously, there's way too many.
Too many? Like, only 1/8 of the topics in this area are polls.
The point is, there shouldn't be that many, let alone threads with polls where they aren't needed.
Posted: Mon Dec 20, 2010 12:01 am
by boywhoflies
I counted them.It's 36 of the over 100 topics(I can't see that ammout, no other pages are loading

).
Posted: Mon Dec 20, 2010 12:04 am
by MyNameIsKooky
It's not as popular now.
Posted: Mon Dec 20, 2010 12:08 am
by boywhoflies
Sorry for DP!
It loaded now, but I needed to close my broswer and re-open it.Anyway, it's 197 topics, and according to my computers calculaor, thats about 71%.
Posted: Mon Dec 20, 2010 10:18 am
by Guppy Star
You found them or made it yourself?

Posted: Mon Dec 20, 2010 1:14 pm
by jozsefkoma
I found it.

Posted: Tue Dec 21, 2010 9:56 am
by Guppy Star
jozsefkoma wrote:I found it.

Found it? Where?
Posted: Tue Dec 21, 2010 10:33 am
by jozsefkoma
On Internet!
I used google.
Posted: Tue Dec 21, 2010 3:51 pm
by Blast!10
I found something very similar in fourth-grade science class:
x / 9 = 0.xxxxxxxx...
xy / 99 = 0.xyxyxyxy...
xyz / 999 = 0.xyzxyzxyz...
xyzt / 9999 = 0.xyztxyzt...
and so on.

Posted: Tue Dec 21, 2010 4:16 pm
by tyteen4a03
This one's very interesting indeed. Pic taken from Wikipedia.
Posted: Tue Dec 21, 2010 4:33 pm
by jozsefkoma

Wow! That is really cool!
0,999...= 1 ???
I think that 0,999...≈1,but 0,999...= 1?
Is amazing!

Posted: Tue Dec 21, 2010 4:59 pm
by Marinus
Posted: Tue Dec 21, 2010 5:13 pm
by StinkerSquad01
Uh....wait what
Posted: Tue Dec 21, 2010 5:13 pm
by StinkerSquad01
Uh....wait what
Posted: Tue Dec 21, 2010 5:20 pm
by StinkerSquad01
Darn dp glitch!_
So, 0.99999999 equals 1?
But it's not possible, because they're two completely different numbers.
Posted: Tue Dec 21, 2010 6:54 pm
by Marinus
No, you didn't read well. You forgot the dots ..... after the nines which mean that the nines are repeated infinitely. 0,999999 is not 1, but 0,999999... however is!
Posted: Tue Dec 21, 2010 7:53 pm
by jozsefkoma
At my country if a number has period instead of 0,999... we write 0,(9).
Posted: Tue Dec 21, 2010 7:54 pm
by jozsefkoma
Sorry for previous post.
I can't edit it.
Instead of "At my country" I wanted to write "In my country"
Posted: Tue Dec 21, 2010 10:54 pm
by StinkerSquad01
Marinus wrote:No, you didn't read well. You forgot the dots ..... after the nines which mean that the nines are repeated infinitely. 0,999999 is not 1, but 0,999999... however is!
I used a _ to try and make a repeat sign. Something popped into my head,
If 8 ninths is 0.888...(right?)
Then 9 ninths would be 0.999...
but 9 over nine is 1!
Posted: Wed Dec 22, 2010 12:45 am
by Marinus
I'm not quite sure what you mean. Do you mean that you understand that 0,99999..... = 1 ?
Posted: Wed Dec 22, 2010 12:48 am
by Qloof234
Here's how it works:
0.999... = x, our variable.
If you multiply x by 10, you get 9.999...
Taking x away from 10x is taking 0.999... away from 9.999... this gives us 9, which is the same as 9x.
Therefore, x = 1 = 0.999...

Posted: Wed Dec 22, 2010 12:54 am
by Marinus
Yes, that's about the same as what Muzo said 2 years ago.

Posted: Wed Dec 22, 2010 9:56 am
by Guppy Star
If a line 1 is perpendicular to line 2, line 1 is infinitely long. If a 3rd line is drawn somewhere from the line 2 to meet line 1 what will be the angle at which line 3 is drawn?
A: 90 degrees (Competitive studies point of view)