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Some links are repeated for use with more than one lesson.

12.1  Rational Expressions

http://www.sparknotes.com/math/algebra2/rationalexpressions/
This site contains links to pages about ration expression terms and problems, as well as adding, subtracting, multiplying, and dividing ration expressions.

http://www.analyzemath.com/Rational_expressions/Rational_express.html
This page defines rational expressions and the domain and has examples about each.

12.2  Simplifying Rational Expressions

http://www.purplemath.com/modules/rtnldefs2.htm
This page explains how to simplify rational expressions.

http://www.algebralab.org/lessons/lesson.aspx?file=Algebra_rational_simplifying.xml
This site has notes and examples on how to simplify rational expressions.

12.3  Multiplying and Dividing Rational Expressions

http://www.purplemath.com/modules/rtnlmult.htm
This page details how to multiply rational expressions and uses examples.

http://www.purplemath.com/modules/rtnlmult2.htm
This page details how to divide rational expressions and uses examples.

12.4  Adding and Subtracting Rational Expressions

http://www.purplemath.com/modules/rtnladd.htm
This site examples how to add and subtract rational expressions through examples.

http://www.regentsprep.org/Regents/math/algtrig/ATO2/addfrac.htm
This page has notes on how to add and subtract rational expressions and has step-by-step solved examples.

12.5  Solving Rational Equations

http://www.algebralab.org/lessons/lesson.aspx?file=Algebra_rational_solving.xml
This page details how to solve rational equations.

http://www.regentsprep.org/Regents/math/algtrig/ATE11/RationalEquationsLes.htm
This site explains different methods of how to solve rational expressions.