The effort to try and take out those slabs in one piece and put them back after you level the ground may not be worth it. Concrete is pretty cheap if you mix it yourself.
Got to ask, though; what's going on under there? any problems with the foundation? Water problems? Sink hole?
You also have the option of replacing with pavers.
You can pull and level and put them back in but it is a lot more labor intensive than breaking out and repouring. Comes down to do you have more time or money? Repouring will cost more. I've done jobs like that back when I was dirt floor poor.
Thanks for the great response ... I think I can get a plan together with this info. My first thought is I do know some younger people trying to start a construction buisness and I may look at removing , leveling and landscaping that area. We dont use that area much.