2017考研数学真题解析（张宇）

我们先来看看大题。这个大题22题概率的大题。X是一个离散的随机变量，取的点的是1/2，1/2，Y的概率密度，Y大于0小于1，这是0，这是其他。那么一个离散一个连续，而且X与Y独立。那么这种问题，第一

2021年考研真题中，数学一第17题是关于函数极限计算的题，数学一第13题是欧拉方程。数二第1题高阶无穷小，第13题是高于二阶的常系数齐次线性微分方程求解问题，第15题是函数极限的计算，第20题是对

【导语】眼瞅着已经进入2020考研冲刺阶段，现阶段对于大部分2020考研新手来说肯定是无比紧张的，在这里无忧考网想提醒大家，稳住心态，冲到最后!距离考研初试时间所剩无几，如何能够更好地做好英语阅读呢?

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新东方在线推荐：2018年考研一次顺利提分课程！！一科不过，全科免费Generallyspeaking,aBritishiswidelyregardedasaquiet,shyandconservativepersonwhois___1___onlyamongthosewithwhomheisacquainted.Whenastrangerisatpresent,heoftenseemsnervous,___2___embarrassed.Youhavetotakeacommutertrainanymorningoreveningto___3___thetruthofthis.Serious-lookingbusinessmenandwomensitreadingtheirnewspapersordozinginacorner;hardlyanybodytalks,sincetodosowouldbeconsideredquiteoffensive.___4___,thereisanunwrittenbutclearlyunderstoodcodeofbehaviorwhich,___5___broken,makestheoffenderimmediatelytheobjectof___6___.IthasbeenknownasafactthattheaBritishhasa___7___forthediscussionoftheirweatherandthat,ifgivenachance,hewilltalkaboutit___8___.SomepeoplearguethatitisbecausetheBritishweatherseldom___9___forecastandhencebecomesasourceofinterestand___10___toeveryone.Thismaybeso.___11___aBritishcannothavemuch___12___intheweathermen,who,afterpromisingfine,sunnyweatherforthefollowingday,areoftenprovedwrong___13___acloudovertheAtlanticbringsrainyweathertoalldistricts!Themaninthestreetseemstobeasaccurate——orasinaccurate——astheweathermeninhis___14___.Foreignersmaybesurprisedatthenumberofreferences___15___weatherthattheBritishmaketoeachotherinthecourseofasingleday.Veryoftenconversationalgreetingsare___16___bycommentsontheweather."Niceday,isn'tit?""Beautiful!"maywellbeheardinsteadof"Goodmorning,howareyou?"___17___theforeignermayconsiderthisexaggeratedandcomic,itisworthwhilepointingoutthatitcouldbeusedtohisadvantage.___18___hewantstostartaconversationwithaBritishbutis___19___toknowswherestobegin,hecoulddowelltomentionthestateoftheweather.Itisasafesubjectwhichwill___20___ananswerfromeventhemostreservedoftheBritish.1.A.relaxedB.frustratedC.amusedD.exhausted2.A.yetB.otherwiseC.evenD.so3.A.experienceB.witnessC.watchD.undergo4.A.DeliberatelyB.ConsequentlyC.FrequentlyD.Apparently5.A.unlessB.onceC.whileD.as6.A.suspicionB.oppositionC.criticismD.praise7.A.emotionB.fancyC.likelinessD.judgement8.A.atlengthB.toagreatextentC.fromhisheartD.byallmeans9.A.followsB.predictsC.defiesD.supports10.A.dedicationB.compassionC.contemplationD.speculation11.A.StillB.AlsoC.CertainlyD.Fundamentally12.A.faithB.relianceC.honorD.credit13.A.ifB.onceC.whenD.whereas14.A.propositionsB.predictionsC.approvalD.defiance15.A.aboutB.onC.inD.to16.A.startedB.conctedC.replacedD.proposed17.A.SinceB.AlthoughC.HoweverD.Onlyif18.A.EvenifB.BecauseC.IfD.For19.A.atalossB.atlastC.insgroupsD.ontheoccasion20.A.stimulateB.constituteC.furnishD.provoke参考答案1.A2.C3.B4.D5.B6.C7.B8.A9.A10.D11.C12.A13.C14.B15.D16.C17.B18.C19.A20.D