A very good day to everyone here on Math Help Forum!

I have a few questions related to algebraic fractions. They are as the following:

1.

2.

3.

My workings are shown below:

1.

?

2.

?

3.

This is where I am stuck.

If you happened to notice any mistakes and blunders, please pinpoint them and explain how it should be done.

Thank you so much for taking your time!