The bones of how to fix this are really in that codex page I linked you to.
The first task is to find out which plugins (or theme) is breaking the rules. And these ARE rules and WordPress standards we are talking about here. So not only is something loading the library from the google CDN – actually I think I noticed more than one doing it – but they are also not using the WP enqueue method which would ensure, at least that only one library gets loaded.
On top of that I noticed that different and old versions were being loaded and WordPress has moved on since those versions. Many things can fail using jQuery versions that old. So this might be a case of using old plugins that are no longer supported.
My advice – to be honest i is always to find which plugin(s) or/and theme is at fault and then lambast the author about their coding practice and ask them to put it right!
But – as that rarely seems to happen – then we can talk you through the changes you would need to make to their code. And there are several examples on these forums although this has not come up for quite some time.