zheikebaxiangguanxuezheqidebuqing，feiyaorangtayongxinzuanyan。
zheimehaodexuexijihuijuranrucilangfei？zhenshibaoqiantianwu！
【yitian，tamengdaoyidaoxuyaoshiyongweijifenjiekaideshuxueti。】
【shehanshuf（x）zai[0，1]shanglianxu，zai（0，1）neikedao，
qief（0）=f（1）=0，f（，）=1。zhengming：cunzaiξ
∈（0，1），shidef'（ξ）=2。】
quanchangshunjianxianrusiyibandejijing，suoyourendoudengdayanjing。
weijifen？weijifenshishenme，tamenzhizhidaopianzhongfen！
nandaozheidaotiyaoyongfaxinglaidabucheng？meiyoupianzhongfenhaidabulele！
qitalingyuderenkandaozheizhongjieshi，jingdexiabadoukuaidiaoxialaile，bieshuodaantamenmeikandong，jiuliantimudeyisidoushiyizhibanjie。
yixierenzaixinliananjiaoku：wozhiqianshuodeneixielangfeidehua，xianzaihouhuihailaidejibu？
qitachaoweimiandaidexueshengmengegechengmujieshe，zheitichaoganglea！
jiuzaidajiadoubeizheidaotinanzhu，yigegejidezhuaernaosai，henbudebatoufadouhaodiaodeshihou。
zheishi，liuhuiyixiazimaochulaile，dandingdishuo：“biezheji，wuyouxietouxu，wulaijieti。”
zhongrendoudaizhule，mashangjiuyourenxiaoshengdunang：“liudarennengjiechulaima？zheititainanla！”
danyeyoubushaorentebiezixindishuodao：“neibixunenga！darenduolihai，kendingmeiwenti！”
haiyourenmanlianqidai，xingfendishuo：“jiushijiushi，zanmenjiudengzhekandarendaxianshenshouba！”
liuhuiweiweimiqiyanjing，renzhendikanxiangtimu，tademuguangzaizheiyixingzishanglaihuisaoshi，meitoujianjiancujin，fangfozainaohaizhongxunsushulizheqizhongyinzangdemailuoheguanjianyaodian。
zhouweiderenyigegeshenqingjinzhang，yanjingyizhabuzhadidingzhekongzi，xindoutidaolesangziyaner，yourenshuangshoujinjinwoquan，yourenbutingdiyanzhekoushui，haiyourenzaixinlimomoqidao:“xiwangdarennengjiekaizheidaonantia！”
shijianyifenyimiaodiguoqu，qifenyufaningzhong，dajialiandaqidoubuganchu，shengpadaraodaoliuhuisikao。
guoleyihuier，liuhuijinzhoudemeitoushuzhankailai，tazhangshuyikouqi，ranhouhuanhuanshuodao：“citiwuyijiechu，buguozheitiqueshibujiandana！”
zhongrenyiting，xianshiyileng，suihoubaofachuyizhenhuanhu。
yourenbujingankai：“lianliuhuidoushuonan，neiguangmukendingshijiebuchulaide！”
suoyourendoubamuguangtouxiangguangmu，panzheguangmunengyougefanying。
【xueziyizhijiebuchuzheidaoti，youyitian，taqufaguoyouwan，hemixieer·luoer（michelrolle）liaodetebiekaixin。】
【pengqiao，zheigexueshengfaxianmixieer·luoerbazheidaotijiechulaile……xueziyixiazimingbaiguolai，yuanlaizheidaotideyongluoerdinglicainengjiekai！】
kanwandaan，yourenjidongdishuo：“zheidaanjianzhitaibukesiyile，sheinengxiangdaohuishizheiyangdesilu！”
haiyourendengdaleyanjing，yiliannanyizhixindebiaoqing，nannanziyudao：“ruciqimiaodedaan，zhenshirangrenpaianjiaojuea！”
gengyourenxingfendishouwuzudao，dashengrangrangzhe：“zheidaanzhenshijuele，fangfodakaileyishanquanxindesiweizhimen！”
liuhuiweiweihanshou，huanhuanshuodao：“cidaanzhijingmiao，shinailingrenshensi，wuyiyousuode。zhishiwubuzhizheiluoershiheren，neifaguoyouzaihechu，wuyuqianwangbaifang，yitanjiujing。”
liuhuijixuningshiguangmu，naohaizhonghuransixufanyong。
来了，领悟来了！
duoshaonianmeiyouzheizhongganjuele？！
“kuaibimosihou！”liuhuixingfen，“wule，wuwule！”
jingguoriyedesisuoyufanfudetuiyan，dangzuihouyibiluoxia，liuhuizhangzhangdishuleyikouqi。
taxinfamingdejietifashoudaoluoerdarendeqifa，burujiujiaota“liuhuidingli”ba！