几道典型初中英语数理化试题的英语作答

《几道典型初中英语数理化试题的英语作答》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、几道典型初中英语数理化试题的解答英语数学题:　　expectednumberAnantandablindspiderareonoppositecornersofacube.Theantisstationaryandthespidermovesatrandomfromonecornertoanotheralongtheedgesonly.Whatistheexpectednumberofturnsbeforethespiderreachestheant?Optional:Alsosolveforasquare,oc

2、tahedron,icosahedron,anddodecahedron.AnswerTheansweris10.Ifthespiderstartedatacornerdiagonallyonthesamefaceastheanttheanswerwouldbe9,andifthespiderstartedatanadjacentcornertheanswerwouldbe7.Hereareanswersforotherfigures:Square:4Octahedron:6Dodecahedron:35Icos

3、ahedon:15初中英语数学题求r的解法Ifyoudrewadotontheedgeofawheelandtracedthepathofthedotasthewheelrolledonecompleterevolutionalongaline,thenthepathformedwouldbecalledacycloid(shownabove),combiningbothforwardandcircularmotion.Whatisthelengthofthepathformedbyonecompleterevo

4、lution?Assumethewheelhasaradiusof1.Answer   Theansweris8r,whererequalstheradiusofthewheel.Thedistanceasthedotmovesfromthe3:00to9:00postioncounterclockwiseis4*21/2.Asitmovesfromthe9:00positiontothe3:00positionthedistanceis8-4*21/2,assumingther=1.初中英语数学题　　求N的解法

5、Givennpointsdrawnrandomlyonthecircumferenceofacircle,whatistheprobabilitytheywillallbewithinanycommonsemicircle?AnswerFornpointstheanswerisn/(2n-1).初中英语数学题　　4道排列组合问题1.Tokeepcomputerfilessecure,manyprogramsrequiretheusertoenterapassword.Theshortestallowablepas

6、swordsaretypicallysixcharacterslongandcancontainbothnumbersandletters.Howmanysix-characterpasswordsarepossibleif(a)characterscanberepeatedand(b)characterscannotberepeated?2.Arelayracehas4runnerswhorundifferentpartsoftherace.Thereare16studentsonyourtrackteam.I

7、nhowmanywayscanyourcoachselectstudentstocompeteintherace?3.Yourschoolyearbookhasaneditor-in-chiefandanassistanteditor-in-chief.Thestaffoftheyearbookhas15students.Inhowmanywayscanstudentsbechosenforthese12positions?4.Auditionsarebeingheldfortheplayshown.Howman

8、ywayscantherolesbeassignedif(a)6peopleauditionand(b)9peopleaudition?看下面给的信息。Partsavailable:studentA,studentB,Principal,Teacher,Librarian,Coach英语物理题　　距离Lightwithawavelengthof500nanometters