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1、2012年全国中考数学试题分类解析汇编(159套63专题)专题27:概率一、选择题1.(2012安徽省4分)给甲乙丙三人打电话,若打电话的顺序是任意的,则第一个打电话给甲的概率为【】A.B.C.D.【答案】B。【考点】概率。【分析】第1个打电话给甲、乙、丙(因为次序是任意的)的可能性是相同的,所以第一个打电话给甲的概率是。故选B。2.(2012山西省2分)在一个不透明的袋子里装有一个黑球和一个白球,它们除颜色外都相同,随机从中摸出一个球,记下颜色后放回袋子中,充分摇匀后,在随机摸出一个球,两次都摸到黑球的概率是【】 A.B.C.D.【答案】A。【考点】列表法或树状图法,概率。【分析】画树
2、状图得:∵共有4种等可能的结果,两次都摸到黑球的只有1种情况,∴两次都摸到黑球的概率是。故选A。3.(2012山西省2分)小江玩投掷飞镖的游戏,他设计了一个如图所示的靶子,点E、F分别是矩形ABCD的两边AD.BD上的点,EF∥AB,点M、N是EF上任意两点,则投掷一次,飞镖落在阴影部分的概率是【】Isteam-orientedandteambuilding.Persistingindemocraticcentralism,improvethelevelofteamsciencedecision,ademocraticdecision.Strengtheningtheconceptofc
3、ollectiveleadership,bycollectivediscussionsanddecisionsonmajorissues.5years,betweenmembersoftheteamdidFrank,equaltreatment,mutualtrust,mutualsupportandformainnovation-oriented,democraticsolidarityanddiligentpeople,honesttypeoffourgoodteams.Second,focusonthetransformationofworkstyle.Requiresteamme
4、mberstoactivelythink,activeofficerstoorganizework,activeinspectionwork,initiative,bytheOfficeandoftheprimarystationandvillage(community),andmakesureregardlessofDivisionoflaborandmutualsupport,mutualHelpandcomplementeachother,understandeachother,improveleadershipskillsofmanaging.Thirdpartyorganiza
5、tionsareweakandlax,strengtheningregulation(community)partyorganizationsandcadres,improveservicelevels,andenhanceteameffectiveness. Theworkstyleofthepartymembersandcadresinthewholetownhasbeenfurtherchanges.2.thecadres,andimprovetheoverallqualityofpartymembersandcadres.First,graspthecadresteamcons
6、truction.Cadresofthenewandimprovedtheregulation,thetownvillageappraisalmethods,trainingofpartymembersandother8work,effectivelypromotethework,putanendtothepreviousshuffle,prevaricationisnotresponsibleforthephenomenon.Second,strengtheningtheconstructionofgrassrootspartyorganizationsandpartymembers.
7、CatchthepartybranchSecretaryofteam-building,improvingoverallquality.Healthyvillage(community)cadreappointmentsystem.Perfectvillage第103页共104页 A.B.C.D.【答案】C。【考点】几何概率。【分析】∵,∴。∴飞镖落在阴影部分的概率是。故选C。4.(2012海南省3分)要从小强、小红和小华三人跟随机