It's Sunday afternoon. Michael's family have a picnic under (在……下面) a big tree. The woman in a blue T-shirt and white pants is Michael's mother. ⑴She is thirty-two. She is a teacher in No. 2 high School. She is cooking now. The man with a guitar is Michael's father. He is thirty-four years old. ⑵He teaches in the same school as Michael's mother. He is a teacher. Michael's little sister likes singing, but she isn't singing now. ⑶“为什么不和我一起去放风筝呢？”Michael问他的小妹妹。⑷Then she flies a kite with her brother. What a happy family!

给定下面一列分式：$\frac{x^3}{y}$,$-\frac{x^5}{y^2}$,$\frac{x^7}{y^3}$,$-\frac{x^9}{y^4}$，…，（其中x≠0）

（1）把任意一个分式除以前面一个分式，你发现了什么规律？

（2）根据你发现的规律，试写出给定的那列分式中的第7个分式．