http://wenku.baidu.com/view/8e8fa500b52acfc789ebc94d.html恩。里面都是这类题目,,都是压轴题吧。还有解析
http://wenku.baidu.com/view/60d66a29647d27284b735159.html
http://wenku.baidu.com/view/8e8fa500b52acfc789ebc94d.html