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#1 Help Me ! » recurring discussion » 2013-10-29 17:10:40

Hoya
Replies: 7

refer from /mathisfun.com/9recurring.html

9X = 9.999... - 0.999...
or:    
9X = 9

But I saw in /mathisfun.com/numbers/infinity.html

∞ - ∞ is undefined.

I have confused.
Can you help me?

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