math,help

what are the challenges of working with rational expressions i've searched in my math book and online i can't seem to find that answer. Can somoene help me out ..

Since this is not my area of expertise, I searched Google under the key words "math rational expressions" to get these possible sources:

http://tutorial.math.lamar.edu/AllBrowsers/1314/RationalExpressions.asp
http://www.purplemath.com/modules/rtnldefs.htm
http://www.sparknotes.com/math/algebra2/rationalexpressions/summary.html

I hope this helps. Thanks for asking.

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