1=0.9999...

<< < (2/2)

brianvds (January 31, 2012, 10:24:41 AM):
I saw this first with dawkin's scale discussions ;)

So I follow the first proof untill here:

a = 0.999...
10a = 9.999...
10a = 9 + 0.999...
10a = 9 + a

why is 9a now 9 please?

From your last step above:

10a = 9 + a
=> 10a - a = 9 + a - a (subtract a from both sides)
=> 9a = 9

cyghost (January 31, 2012, 10:28:34 AM):
Thank you, briandvds, I follow that :)

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