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Author Topic: 5 + 5 + 5 - 5 + 5 + 5 - 5 + 5 x 0 = ? 353 replies
Andrew Lawrence
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Old post #330 posted Apr 5th 2012, 20:08:33 Quote 
Quote ( Shoaib Mohamed @ April 5th 2012,20:04:42 )

Dick shaped

With your profile picture, I don't want to imagine what you think of.
Eric Bolder
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Old post #331 posted Apr 5th 2012, 20:21:46 Quote 
Quote ( Phil Maunder @ April 5th 2012,19:36:34 )

1 = 2


Yes 1 =2

X = Y
so
X-Y=0
Both sides times 2 ;)
2X-2Y=0
Lets say then
2X-2Y = X - Y , true because both sides are still 0 :)
So
2(X-Y) = X - Y
Now divide both sides by X-y!
2=1!!!!!!!!
Shoaib Mohamed
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Old post #332 posted Apr 5th 2012, 20:23:22 Quote 
Quote ( Andrew Lawrence @ April 5th 2012,20:08:33 )

With your profile picture, I don't want to imagine what you think of.

With your posts, I don't want to imagine what you think of.
Kevin Savoie
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Old post #333 posted Apr 5th 2012, 20:36:35 Quote 
ORDER OF CALCULATIONS:
1-Brakets
2-Exponential
3-MULTIPLICATION AND DIVISION
4-ADDITION AND SUBSTRACTION

Try =5+5+5-5+5+5-5+5*0 in Excel, then those that say it`s 0, SHUT UP and listen in school!!!
Daneks Britāls
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Old post #334 posted Apr 5th 2012, 20:38:28 Quote 
My friend is asking (yeah....many people is reading this thread yet :D ).....

-infinity + (+infinity) :2 = ?

BUT TAKE A NOTE>>>TODAY IS GREEN THURSDAY LOL :D :D
Csaba Szabó
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Old post #335 posted Apr 5th 2012, 20:38:49 Quote 
15
Michael Monaco
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Old post #336 posted Apr 5th 2012, 20:40:01 (last edited Apr 5th 2012, 20:46:38 by Michael Monaco) Quote 
Quote ( Eric Bolder @ April 5th 2012,20:21:46 )

Yes 1 =2

X = Y
so
X-Y=0
Both sides times 2 ;)
2X-2Y=0
Lets say then
2X-2Y = X - Y , true because both sides are still 0 :)
So
2(X-Y) = X - Y
Now divide both sides by X-y!
2=1!!!!!!!!


This has been explained various times. You cannot divide by X-Y because it equals 0. You cannot divide by 0

Quote ( Daneks Britāls @ April 5th 2012,20:38:28 )

-infinity + (+infinity) :2 = ?


This isnt a valid question. You cant use infinity as a real number ... mainly because it is not.
Chinmay Dhopate
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Old post #337 posted Apr 8th 2012, 23:49:32 Quote 
Quote ( Marcelo Michelini @ April 5th 2012,20:02:50 )

Quote ( Phil Maunder @ April 5th 2012,19:36:34 )

pps. it's also possible to prove that 1 = 2

that's not possible


Let me prove to you: 4 = 5

-20 = -20
16 - 36 = 25 - 45
4^2 - 9*4 = 5^2 - 9*5
4^2 - 9*4 + 81/4 = 5^2 - 9*5 + 81/4
(4 - 9/2)^2 = (5 - 9/2)^2
4 - 9/2 = 5 - 9/2
4 = 5

Go.
Andrei Ciuchi
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Old post #338 posted Apr 8th 2012, 23:57:31 (last edited Apr 8th 2012, 23:58:27 by Andrei Ciuchi) Quote 
Well, clearly you cheated applying that square root there and ignoring the fact that square root[(4 - 9/2)^2] can be both -0.5 and +0.5, after you actually calculate this (4 - 9/2)^2 to be 0.25. :)


So, technically, what you did above is incorrect.
Chinmay Dhopate
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Old post #339 posted Apr 8th 2012, 23:59:47 (last edited Apr 9th 2012, 00:00:49 by Chinmay Dhopate) Quote 
Hush Andrei. I wanted to see how much time passed before people figured that out :p

I should have probably elaborated it a bit more and put some more functions in there after that step...
Andrei Ciuchi
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Old post #340 posted Apr 9th 2012, 00:00:16 Quote 
Oops ... sorry. :)
Steven Gaskell
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Old post #341 posted Apr 9th 2012, 00:06:17 Quote 
Quote ( Chinmay Dhopate @ April 8th 2012,23:49:32 )

-20 = -20
16 - 36 = 25 - 45
4^2 - 9*4 = 5^2 - 9*5
4^2 - 9*4 + 81/4 = 5^2 - 9*5 + 81/4
(4 - 9/2)^2 = (5 - 9/2)^2
4 - 9/2 = 5 - 9/2
4 = 5


Line 1 - correct
Line 2 - correct
Line 3 - correct
Line 4 - correct
Line 5 - correct
Line 6 - incorrect. Square roots of numbers are not unique over R. Therefore you cannot say because two numbers squared give the same answer, those numbers must be the same - it's an incorrect statement.

Next?
Michael Monaco
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Old post #342 posted Apr 9th 2012, 02:53:58 Quote 
Quote ( Chinmay Dhopate @ April 8th 2012,23:49:32 )

4^2 - 9*4 = 5^2 - 9*5


This is incorrect because:

4^2 = 16
16 - 9 = 7
7*4 = 28

and

5^2 = 25
25-9 = 16
16*5 = 80

... or so half the ppl in this thread would say...

/sarcasm
Rafal Celejewski
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Old post #343 posted Apr 9th 2012, 02:55:13 Quote 
probably :D because "there are no brackets ! " :)
Tatu Nenonen
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Old post #344 posted Apr 9th 2012, 03:35:54 Quote 
20 it is! D:
Luan Silva
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Old post #345 posted Apr 9th 2012, 05:35:24 Quote 
It's 0
Darius Moldovan
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Old post #346 posted Apr 11th 2012, 16:45:58 Quote 
It's 15!
Radomir Mihai
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Old post #347 posted Apr 11th 2012, 17:01:57 Quote 
it`s easy 15.
James Hitchen
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Old post #348 posted Sep 29th 2012, 20:37:28 Quote 
It's zero because if x0 at the end of a sum your answer is always zero
Mairo Toom
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Old post #349 posted Sep 29th 2012, 20:38:17 Quote 
Quote ( James Hitchen @ September 29th 2012,20:37:28 )

It's zero because if x0 at the end of a sum your answer is always zero

Go back to school ! :P
Adam Plumb
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Old post #350 posted Sep 29th 2012, 20:38:42 Quote 
0
Joe Manifold
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Old post #351 posted Sep 29th 2012, 20:39:00 Quote 
Wow... BIDMAS/BODMAS rule, however you like to say it. Read up on that basic maths rule, James.
Vlad Tersenov
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Old post #352 posted Sep 29th 2012, 20:39:30 (last edited Sep 29th 2012, 20:40:00 by Vlad Tersenov) Quote 
20
Ramón Lopez
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Old post #353 posted Sep 29th 2012, 20:39:34 Quote 
Quote ( James Hitchen @ September 29th 2012,20:37:28 )

It's zero because if x0 at the end of a sum your answer is always zero


No parentheses!! So 15!
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