1)定理/Theorem：1=-1

　　证明/Proof：

　　x=1

　　x^2=x

　　x^2-1=x-1

　　(x+1)(x-1)=(x-1)

　　(x+1)=(x-1)/(x-1)

　　x+1=1

　　x=0

　　0=1

　　=>0/0=1/1=1

　　2)Pi

　　Severalscientistswereallposedthefollowingquestion:"Whatispi"

　　Theengineersaid:"Itisapproximately3and1/7"

　　Thephysicistsaid:"Itis3.14159"

　　Themathematicianthoughtabit,andreplied"Itisequaltopi".

　　Anutritionist:"Pieisahealthyanddeliciousdessert!"

　　3)

　　Amathematician,aphysicist,andanengineerweretravelingthroughScotlandwhentheysawablacksheepthroughthewindowofthetrain.

　　"Aha,"saystheengineer,"IseethatScottishsheepareblack."

　　"Hmm,"saysthephysicist,"YoumeanthatsomeScottishsheepareblack."

　　"No,"saysthemathematician,"AllweknowisthatthereisatleastonesheepinScotland,andthatatleastonesideofthatonesheepisblack!"

　　4)Anabsentmindedprofessor(alright,itwasNorbertWeiner)wasmoving.Hiswife,knowingNorbertwouldforgethisaddress,tookoutasheetofpaperandwroteitdownforhim.Laterthatday,Norberthadaflashofinsight,andfumblingforapieceofpaper,wrotedownhisnewtheoremonthepaperhiswifegavehim.Onfurtherreflection,Norbertfoundafallacyinthisthinkingandthrewoutthepaperindisgust.Whenhecamehomethatnight,tothenowemptyhousehemovedfrom,herememberedhehadmoved,buthadnoideawherehehadmovedto.Justthenhespiedalittlegirlonthestreet."Littlegirl,"heasked,"mynameisNorbertWeiner,doyouknowwhereIlivenow?"

　　"Yesdaddy,mommythoughtyouwouldforget."

　　5)

　　Appliedmathematics

　　ROMANCEMATHEMATICS

　　Smartman+smartwoman=romance

　　Smartman+dumbwoman=affair

　　Dumbman+smartwoman=marriage

　　Dumbman+dumbwoman=pregnancy

　　OFFICEARITHMETIC

　　Smartboss+smartemployee=profit

　　Smartboss+dumbemployee=production

　　Dumbboss+smartemployee=promotion

　　Dumbboss+dumbemployee=overtime

　　SHOPPINGMATH

　　Amanwillpay$2fora$1itemheneeds.

　　Awomanwillpay$1fora$2itemthatshedoesn'tneed.

　　GENERALEQUATIONS&STATISTICS

　　Awomanworriesaboutthefutureuntilshegetsahusband

　　Amanneverworriesaboutthefutureuntilhegetsawife.

　　Asuccessfulmanisonewhomakesmoremoneythanhiswifecanspend.

　　Asuccessfulwomanisonewhocanfindsuchaman.

　　HAPPINESS

　　Tobehappywithaman,youmustunderstandhimalotandlovehimalittle.

　　Tobehappywithawoman,youmustloveheralotandnottrytounderstandheratall.

　　LONGEVITY

　　Marriedmenlivelongerthansinglemen,but

　　marriedmenarealotmorewillingtodie.

　　MEMORY

　　Anymarriedmanshouldforgethismistakes,there'snouseintwopeoplerememberingthesamething.

　　APPEARANCE

　　Menwakeupasgood-lookingastheywenttobed.

　　Womensomehowdeteriorateduringthenight.

　　PROPENSITYTOCHANGE

　　Awomanmarriesamanexpectinghewillchange,buthedoesn't.

　　Amanmarriesawomanexpectingthatshewon'tchange,andshedoes.

　　DISCUSSIONTECHNIQUE