[br][b]Simplify[(x + 1)/(x - 2) + (2x - 3)/(x - 2)][/b]
[br][b]Simplify[(1/x) + (2/(x + 1))][br][br][br][br][br][br][/b]
[br][b]Simplify[(x + 2)/(x^2 - 1) - (x - 1)/(x^2 - 1)][/b]
[b]What is the common denominator?[/b][br][b]How does CAS help students confirm or discover the correct procedure?[/b][br]