答：不知道你是什么专业的大学生,数学专业吗?如果光想知道 介词+which 引导定语从句 和which ,where引导定语从句的话,不用那么难的例句来说明,会更容易些.
1.介词+which显然与which引导定语从句是不一样的.如：
The book in which there are many pictures is mine.这句话中,in which不能改为which.我们将定语从句还原：There are many pictures in the book.(in which= in the book)
2.where 经常可以用一个介词+which来代替,但是,不是所有的介词+which都可能用where来替替换的.如：The book on which there is a cup is mine.这句中on which就不能用where来代替.
定语从句还原：There is a cup on the book.( on which=on the book)
在考虑用什么介词时,将定语从句还原会容易些.
3.非限制性定语从句常用逗号隔开.which常可用来指代整个句：
He got the first prize,which made us very happy.