If you can assume the fools are so coorporative, you don't have to make such a 'sophisticated' question, you can simply ask 大傻: "That wisdom tree is on top of the mountain, right?", then 大傻为了回答这个问题,先去问三傻(大傻 will not ask 二傻, because he knows he can not derive the right answer from 二傻 directly) , 三傻为了回答这个问题,先去问二傻....
After the fools have all gone through their due dilligence using their specific logic, all you need to do is to reverse 大傻's answer.
Actually, you can solve both questions you posted COMBINED without ask any question. Just tell them: stand in front of the wisdom tree in the order of 大,二,三 from left to right. As long as the fools are in the same spirit of coorporation, you will figure out who is who and where is the tree -- and technically, you haven't ASKed a question yet.