Is it possible to show some bar with additional information to new posters that if it considers an exercise/homework question, it is necessary to provide enough context (e.g. where have you found the problem, why do you want to know the answer to the problem) and show the effort they have already done (which techniques do they think are needed, what have they already tried)? And show this information in a colorful banner, and they need to add a check mark to show that they have read this. And also write that the question will not be answered and downvoted or closed otherwise.
I guess most new users just don't know they are doing anything wrong and they suggest that we know all their answers within a milisecond of time, and as such don't need to show their effort.
Maybe also add an exercise or homework tag such that maybe we can implement a feature to filter out those questions if we don't want to be bothered with exercises for a while.