试听：[url]http://www.1q84.fm/system/boat/JL4tTDig.mp3[/url] 三毛作品集：[url]http://seablog.iteye.com/blog/1329272[/url]
![BP神经网络推导+示例[图]](data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACwAAAAAAQABAAACAkQBADs=)