I have no sympathy for people just copying the text of the homework questions to the site (sometimes they even scan the page, to avoid having to write the text...)
On the other side, I believe that there are many people who would really just have a hint to take the right way to demonstrate the result they need. However, if someone is not used to the site it is not easy to state in advance what have they tried, or better to explain the context where they had received the problem.
So I wonder if the side column "How to ask" could be expanded a bit with a direct link to a FAQ "is yours a homework question?". (Having the side column on the left side would help a lot, but I don't think it's a viable path)