While other sites on the network are plagued with them, we have a very low incidence of homework questions. But still, they crop up now and then. Just today, I had to close a "give me the exact solution" plea, starting with HELP in all caps.
It is probably best to codify the way we want to handle homework question. And this doesn't necessarily mean an outright ban, because sometimes good questions arise when somebody is trying to solve a difficult homework problem, and we could encourage that, both for the sake of the inquisitive student and the site.
How should we deal with homework questions? Do we want special rules for them, or do we just deal with them on a case-by-case basis?
As an example, here is how biology.SE handles them.