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Forums \ General forum \ Math question!
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1 year ago
#81
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shadow.steps
Just consider A = 0.9999999...

A = 0.999999...
10 x A = 9.999999....

minus the two equation

9 x A = 9 ===> A = 1

THIS IS EXACT 1 NOT NEAR ONE.

AND YOU PEOPLE SHOULD KNOW THAT
Infinity is not a number and you cant add 1 to infinity , infinity is a concept

so all of I + x = I SO x = 0 is not legal in math world. y'all will be busted.
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1 year ago
#82
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shadow.steps
question... we all know that any thing divided by itself is 1 correct
1/1=1
5/5=1
107/107=1
54752/54752=1

so does 0/0=1??

did i just beat the system?


Dividing is a sub-funtion of multiply so when you say

6 / 2 = 3 you are saying that 6 x (1/2) = 3

the definition of dividing is like this.

and we call (1/2) inverse number for 2.
inverse number of X is a number like Y that fits in below equation.

X * Y = 1

So assume we are going to find 0's inverse number X

we have no number that fits below


0 * X = 1 because "everything" x 0 = 0

conclusion : divide is not defined for 0
Problem solved and everyone is happy.
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1 year ago
#83
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Ryze
39 got it right
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1 year ago
#84
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no_bingo
#45
0.8 reoccuring = 1-0.1 reoccuring

Now think of a number that you will have to minus from 1 to get 0.9 reoccuring. Hope this helps :)

#69

Division and subtration aren't really a natural kind of operation but when ur dividing ur essentially finding a number that when mutiplied to the denominator will give you the numerator e.g 6/3 =2 => 2 * 3 =6 . but a/0 = b => b * 0 = a which does not work because b can be anything.

#43

You don't to be a maths genius for economics but maths provide the foundation for a lot of economic theory. Hell without maths you probably only have the buy low sell high rule.
This post was edited by its author @ 1 year ago
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1 year ago
#85
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Rhetoric
Don't feed the trolls.. ( like 0/0 = 1 or disagreeing against 10/3 = 3.333...)

Juz close this thread.. Oh wait.. the topic starter is ....

Like the 2 other guys before me have pointed out, go read this post

" http://en.wikipedia.org/wiki/0.999... "

and after reading the section of 'Skepticism in education' , hopefully, you will see the truth and the misconceptions that our education system had drilled us into our heads..

Just like what my prof. said, The first lesson in university starts with forcefully forgetting everything that you have learned in your previous schools / colleges and etc.. If not, you simply won't catch on.. ( Does not apply to every disciplines thou.. )
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1 year ago
#86
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ezprodigy
lol there's actually a wiki article about this
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1 year ago
#87
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pshic
#71 LOL, made my day

on topic
9,9999.... = 10 (not 1)
0,9999.... = 1
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1 year ago
#88
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JimCarry
funny how this thread is 70 posts too long since someone already explained why 0,99999999...... = 1

x=0,99999....
10x=9,99999999.....
10x-x=9,999999...-0,999999...
9x=9
x=1

simple as that, maybe spend more time studying and less time trolling forums.
Also you would probably need some kind of math-based education to understand this :) So any1 who studied like "motor-mechanics" or any other non-math based education should stay out of this. :D
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1 year ago
#89
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shitezukani
i cant believe such an easy question would take so many arguments,,, lol

of course,,, 0.99 or 9.99 will never be equal to 1 or 10 respectively,,

its like a graph of tangent function,, that it will never reach -/+ (pi/2) in the x-axis,, but will reach infinity in the y-axis
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1 year ago
#90
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godlike_Efre
#89 Hey mr.troll ! You say easy question but u are still wrong. To understand theese math question u should study some concepts of infinity.

Here is a really good video about infinity!

http://www.youtube.com/watch?v=UYgExez7BUY
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1 year ago
#91
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furi4
#88 got it rigth.

It's pretty easy to understand indeed.
Here is my demonstration:

1/3 + 1/3 + 1/3 = 1

1/3 = 0.3333333....

1/3 + 1/3 + 1/3 = 0.333333... + 0.333333... + 0.3333333... = 0.99999999...

then

1/3 + 1/3 + 1/3 = 1 = 0.9999999...
This post was edited by its author @ 1 year ago
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1 year ago
#92
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chelom
well the problem with infinity is that makes the difference between two numbers 0 but by doing that u destroy some propertis on the numbers. like i explained u have a series that converges to Pi using only rationals numbers u cant form a irrational using rationals numbers cause rationals is a closed set thats why infinity doesnt exist in the practice u have to use limits to try to get the infinity. which is an aproximation a really good one or whateever u want to call it.

a good example where limits ruins everything is when u have limit when k tends to infinity tell me how big k is? remember that infinity doesnt belong to reals so the only thing u can say about k is that its pretty big compared to the numbers u know. so the result will depend on another thing u argument that any really big number divided by a minor numbers is infinity(which doesnt exist) or 0 if its the contrary but for any x,y that belongs to R x/y!=0 unless x=0 itself. what im trying to say are that noone understand infinity u use it but that doesnt mean u can understand it, none can.

using infinity at his context like filling with 0.9999 with nines is not posssible, if in any case someone do it ofc 0.(9999) is equals to 1 but in teory cause as someone mentined theres no number between 0.9999 and 1.
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1 year ago
#93
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Zapple
http://en.wikipedia.org/wiki/0.999...
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