how about 你觉得怎么样?
同义的问法有：what about
what do you think of
此外,如果后面是动词的词组的话,还可以用why not,why don't you,也是表你觉得怎么样,这里有反问的意思.
所以说,具体的答案就是：
How about this book?=What about this book?= What do you think of this book?
望楼主采纳.