Alright, I'm fairly new at this so this is my look at this. I had to do this fast so I only did the first step i.e. what my gut tells me.


Ex 1. I call with A8+, TT+ Not much more, yes I'm nitty.

Ex 2. No I wouldn't call but Im pretty close. Since I didn't reraise he prob knows I dont have KK or AA. His early raise tells me he had something as does his shove. If he had 99, JJ or KK then I beat him. Shoving with 99 is kamikaze but possible. If he had AQ, TT, QQ, AA then I am lost.
If he had a set why the all-in? He could be afraid that I make a straight later. Or He has the str8 draw (AK) and wants me out (rare IMHO). I think 2 pair or bottom set and he wants the pot now...I fold.

Ex 3. I only call with JJ+ The pot odds are nice but the 2 raises behind me worry me.
I raised and had 2 raisers behind. The SB shoved without worry of the BB so I think he has something.

Those are my "gut feeling" answers. I don't have any method to work it out on paper yet or any calculation methods, I'm still having to learn that.