I bought some Chinese coins in various provinces while traveling in China. I know for sure most of them should be fakes and I don't even have doubts about them being fakes because they look fake or because they cost me pennies. The trouble is I cannot remember how much I payed for them nor when and where exactly I bought them, but I hope some of them should be genuine.
I'll start with the three big Chinese coins with a square in the middle that kinda look like traditional feng-shui coins and I haven't seen anything like it on the web. So hopefully you can help me. Here are the photographs:


My questions are:
1. Do they look real? How do I recognize a fake?
2. What coins are these?
3. What would they be worth?