If you want to practise with polynomials and algebraic fractions,  here you have this link
                                                      http://www.minimath.net/index_es.htm

You can try to do on your note.ook these exercises and check your results with this instrument (not nneded to say that the more you prctise the more you learn)

Exercise 1
Simplify

Exercise 2

Operate, previously reducing to common denominators (help) and after that simplify the results

                   

Exercise 3

Operate and simplify

              

Exercise 4

Multiply or divide these fractions but, first of all decompon each polynomial in prime factors: