Math 2

[Guest]

are you aware that 0.99999999 repeating is equal to 1 ? watch this

say that o.999999 repeating equals x

10x = 9.9999999999 repeating

subtract 1x from both sides and you get
9x = 9.000000000

divide both sides by 9 and you get

x = 1

weird huh?

[cystic crypt]

@FleetCommander:

are you aware that 0.99999999 repeating is equal to 1 ? watch this

say that o.999999 repeating equals x

10x = 9.9999999999 repeating

subtract 1x from both sides and you get
9x = 9.000000000

divide both sides by 9 and you get

x = 1

weird huh?

no,
if you subtract 1 from 9.9 repeating, you get 8.9 repeating.

[K-Ration]

Yeah that is neat. One of those counter intuitive math things that doesnt seem right but is. =p

[Grigoriy Ivanovitch]

It’s kind of like the thing where you can get 1=2. I forget how that went, but I’ll see if I can’t figure it out again.

[Dirt Baller]

@FleetCommander:

are you aware that 0.99999999 repeating is equal to 1 ?

Yes, they are equal. It’s like saying the limit of 1-x as x approaches 0 equals 1.

[Dirt Baller]

@Grigoriy:

It’s kind of like the thing where you can get 1=2.

Let x=y, then
xy=x^2
xy-y^2=x^2-y^2
y(x-y)=(x+y)(x-y)
y=x+y
y=y+y
y=2y
1=2
:lol:

[Guest]

Well…

1/9 in decimal is 0.1111…
Thus, 0.999… is 9*1/9 = 1
not too suprising :)

@Dirt:

Let x=y, then
…
y(x-y)=(x+y)(x-y)
y=x+y
…

The good old “divide by zero” trick :)

nice is alos when you use only the positive solution of a square root and forget about the negative one.

[Grigoriy Ivanovitch]

nice is alos when you use only the positive solution of a square root and forget about the negative one.

I didn’t forget, I just…decided not to include it. Yeah. :roll: