The denominators are very nearly factored. You should be able to do it by inspection.

First) 2, (x-1), (x+1)

Second) 2, 3, (x-1), (x-1)

Just read off the LCD by meeting the needs of all denominators.

2, (x-1), (x+1), 3, (x-1) again. ==> 2*3*(x+1)*(x-1)^2