For students everywhere: I put work on both sides for a reason. Yes, you need to do both sides. More importantly, if the homework is hard, that’s why you need to do that homework. My responsibility is to make sure I’m not sending home things that you have never seen before, things that are genuinely outside of your understanding. Your responsibility is to strain your brain a little. If you can blast the homework out without thought in just a few minutes, I probably wasted both your time and mine.
(Reinforcing math computations and simple grammar rules is an exception to what I just wrote.)
In general, you don’t learn from doing easy stuff. You learn from doing the stuff that takes thought and effort.