Posted by Johnnie on Tuesday, February 10, 2009 at 10:20am.
Your symbolism is absolutely not standard.
For instance,
what happened to the negative sign in the denominator?
72/-18=72/18 is just not true.
Secondly,
This is silly. How can 18 be 4?
72/18=72*1/4
What would be wrong with 72* 1/18 ? (assuming the sign was right, which I think it is not)
Surely your text has examples on this.
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