数列３：連立漸化式《大学受験数学》

I filmed this yesterday. I filmed all the patterns of recurrence relations for sequence 2 about a year ago, so I think it would be best to watch that first. You can find it on the playlist or on my website. Actually, I find it difficult to decide how much to explain about recurrence relations, simultaneous recurrence relations, various sequences, etc. In person, I can explain things a little roughly, as if the students already know this much, and just say, "Come ask me if you have any questions." But with a class on basic topics like this, there's bound to be a wide range of prior knowledge on the part of the viewers, so they're imagining things and either breaking it down too much and making it too long-winded, or being too simple and leaving them with questions like "Why?" or "What if this happens?" Looking back at it now, the part where I explain all the patterns of difference sequences for recurrence relations is a bit messy, and I think it would be difficult for test takers without the prior knowledge to understand. My own thoughts change from time to time. In short, I'm always struggling with how to explain things. I'll do my best to update as frequently as possible. I want to do something about the habit of putting off preparing for the next problem, like summer homework.