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平行四边形ABCD中，若点M，N满足，，设，则λ﹣μ＝（ ）
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高一下学期数学《》真题及答案
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平行四边形ABCD中E为CD的中点若在平行四边形ABCD内部随机取一点M则点M.取自△ABE内部的概
下列命题①一组对边平行另一组对边相等的四边形是平行四边形②对角线互相平分的四边形是平行四边形③在四边
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如图在平面直角坐标系xOy中四边形OACB是平行四边形A.B.两点的坐标分别为2﹣4﹣40抛物线Q.
如图1在四边形ABCD中已知AB=BC＝CD∠BAD和∠CDA均为锐角点P.是对角线BD上的一点PQ
如图在四边形ABCD中对角线ACBD相交于点O.AE=CF且四边形DEBF是平行四边形.求证四边形A
已知平行四边形ABCD对角线ACBD交于点O.1若AB=BC则平行四边形ABCD是_________
已知如图在平行四边形ABCD中点E.在AD上连接BEDF//BE交BC于点F.AF与BE交于点M.C
已知园边形ABCD中AC与BD交于点O.如果只给出条件AB∥CD那么还不能判定四边形ABCD为平行四
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如图在平行四边形ABCD中已知M和N分别是边ABDC的中点试说明四边形BMDN也是平行四边形.
如图四边形ABCD是平行四边形M.N.是对角线BD上的两点且BM＝DN.求证四边形AMCN是平行四边
已知平行四边形ABCD的对角线交于点O则下列命题是假命题的是
若AC⊥BD，则平行四边形ABCD是菱形
若BO=2AO，则平行四边形ABCD是菱形
若AB=AD，则平行四边形ABCD是菱形
若∠ABD=∠CBD，则平行四边形ABCD是菱形
在四边形ABCD中AC与BD相交于点O.如果只给出条件AB∥CD那么还不能判定四边形ABCD为平行四
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已知四边形ABCD是平行四边形PQ是直线AC上的点且AP=CQ求证四边形PBQD是平行四边形.
已知四边形ABCD中AC交BD于点O.如果只给条件AB∥CD那么还不能判定四边形ABCD为平行四边形
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已知:如图EF是四边形ABCD的对角线AC上的两点AF=CE连接DEDFBEBF.四边形DEBF为平
已知四边形ABCD中AC与BD交于点O.如果只给出条件AB∥CD那么可以判定四边形ABCD是平行四边
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如图在▱ABCD中对角线ACBD交于点O并且∠DAC=60°∠ADB=15°．点E是AD边上一动点延
平行四边形→矩形→平行四边形→菱形→平行四边形
平行四边形→菱形→平行四边形→矩形→平行四边形
平行四边形→矩形→平行四边形→正方形→平行四边形
平行四边形→矩形→菱形→正方形→平行四边形
如图平行四边形ABCD中M.N.分别是ABCD的中点将四边形MBCN沿直线MN折叠后得到四边形MB′
在平行四边形ABCD中∠BAD的平分线AE交BC于点E.且BE=3若平行四边形ABCD的周长是16则
如图所示在四边形ABCD中点E.F.是对角线BD上的两点且BE=FD.1若四边形AECF是平行四边形
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8分Studentsshouldbeabletoshowwhattheyknow.Manyfolkstakethisasanapparenttruth.ButIthinkitdemandscloserexamination. Possessingaskillorpieceofknowledgeisnotthesamethingasbeingabletoshowit.Thisiswhymanysmartyoungpeoplehateschool.Understandingfiguringoutandgettingahandleonapieceofknowledgeisreallyexcitingbuthavingtoprovetosomebodyelsethatyouunderstandisapainintheneck. Findingproofofstudentlearningisahugepartoftheteacher'sjobandwhetheritisdonepoorlyornotmakesallthedifferenceinthatteacher'seffectiveness.ThereisahugedifferencebetweenhowdoIfigureoutifthisstudentunderstandsandhowdoImakethisstudentprovetomehegetsit.Thefirstisavaluableapproachthesecondisthefirststepontheroadtowardwastingeverybody'stime. Andthere'stheproblem.Ifwestartwiththeassumptionthatastudentwhoknowsmustbeabletoshowhisknowledgetooursatisfactionwewillbetravelingdownthewrongroad.Themorewedemandthatstudentsprovetousthattheyknowthestuffthemorewewilldesignartificialtasksthatdemandasetofskillsandknowledgeentirelydifferentfromthosewereallywanttomeasure. AsaclassroomteacherIhavetorememberthattheburden重担isonmetofindawaytoseewhatmystudentsknowtheburdenisnotonthemtoputonwhatevertrainedmonkeyshow. ItmaynotbetheworstthingevertosayStudentsshouldbeabletoshowwhattheyknow.ButIthinkit'sfarmoreusefultosayTeachersshouldbeabletodiscoverwhatstudentsknow. 1Whatdoestheunderlinedphraseinthesecondparagraphmean? A.Verydangerous. B.Veryannoying. C.Verysurprising. D.Veryfrequent. 2Accordingtothethirdparagraphateachershouldhavetheabilityto. A.discoverwhetherhisstudentshaveunderstood B.avoidwastingtheprecioustimeinclass C.applyvariousapproacheswhileteaching D.givestudentsthechancetoprovethemselves 3Whatdoestheauthorthinkoftheartificialtasksdesignedtoteststudentlearning? A.Theyshouldbelimitedinnumber. B.Theyareahugeburdenonteachers. C.Theyshouldmainlyfocusoneffectiveness. D.Theyslideawayfromtheoriginalpurpose. 4Whatisthemainideaofthepassage? A.Studentsshouldbeabletoshowwhattheyknow. B.Therearemanywaystofindproofofstudentlearning. C.Teachersshouldbeabletodiscoverwhatstudentsknow. D.Thereshouldbebetterunderstandingbetweenteachersandstudents.
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如图所示倾角为30°的粗糙斜面与倾角为60°的足够长的光滑斜面对接在一起两斜面上分别放有质量均为m的物块甲和乙两物块通过一跨过定滑轮的细线连在一起．在平行于斜面的拉力F的作用下两物块做匀速运动．从图示位置开始计时在甲物块与滑轮相碰前的一段时间内下面的图象中x表示每个物块所通过的路程E表示两物块组成的系统的机械能EP表示两物块组成的系统的重力势能Wf表示甲物块克服摩擦力所做的功WF表示拉力F对乙物块所做的功则图象中所反映的关系可能正确的是
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30分TwoyearsagoIdonatedmykidney肾tomybrother.Iconsidereditacompletelifechangingexperiencenotonlyforthetwoofus1fortheentirefamily.Weendedup2fromsurgery外科手术atafriend'shomeinBatonRougeLA.His3touswasunforgettable.Wehadreceivedsomany4.Wehadgottenfooddonationfromsomanypeoplewho5ussomethingbeyondphysicalcomfort.Nowmybrotherisbackonhisfeetandislivinglife6normal.LastAprilhe7togivebacktothecommunity社区by8moneyfortheMedicalAssociationthroughcycling180milesfromHoustontoAustin.Ifeltgreatlymovedtearsineyes9thatmykidneygavehimasecondchanceinlifeandthatheisnowlivingbeyondwhatheimagined10tobe.Recentlyourmothersufferedfrombreastcancer.11shewastheonewhotookcareofmeandmybrotherwewantedtodosomethinginher12.MybrothermysisterandIaregoingto13nextyearfortheCancerSociety14mybrotherandIwillbejoininginthehalfmarathoninhonourofourmotherandthiswillbeourgoodchancetobekidneydonation15aswell.We16duringoursurgerythatseveralthousandpeoplediefromkidneydiseaseeveryyear.Patientswouldbeonthe17listforkidneydonationandmanyofthemendupindeathbecauseofthe18ofkidneydonors.IfmybrotherandIcan19otherstodothesamethingIdidmaybemoreliveswillbesaved.20onlyIhadmorekidneysIwoulddoitagainforotherpeople.1A.and B.but C.so D.or2A.rebuilding B.reusing C.recovering D.reserving3A.kindness B.courage C.power D.manners4A.friends B.people C.patients D.doctors5A.devoted B.contributed C.delivered D.gave6A.against B.under C.beyond D.for7A.decided B.urged C.demanded D.insisted8A.earning B.lending C.donating D.raising9A.knowing B.expecting C.hoping D.reporting10A.future B.life C.success D.luck11A.If B.Though C.Because D.Before12A.place B.job C.health D.honour13A.run B.study C.cheer D.fight14A.as B.when C.while D.however15A.sellers B.collectors C.volunteers D.advocates16A.figuredout B.foundout C.learnedfrom D.lookedinto17A.working B.waiting C.sending D.growing18A.delay B.common C.lack D.help19A.encourage B.support C.order D.affect20A.But B.Not C.Just D.If
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FeCl3易潮解易升华实验室制备FeCl3的装置如图所示加热和夹持装置略去．下列说法正确的是
请回答下列问题 1SCN﹣与Fe3+可形成多种配离子其中一种为[FeSCN6]3﹣该配离子中的SCN﹣会使Fe3+的剩余价电子压缩配对则每个配离子中Fe3+的单电子个数为个． 2镓失去电子的逐级电离能单位kJ•mol﹣1的数值依次为5771984.52961.86192由此可推知镓的主要化合价为和+3． 3有一种由1～9号元素中的部分元素组成且与SCl2互为等电子体的共价化合物它的分子式为． 4已知S4O62﹣的结构为其中S原子的杂化方式是．键长ab填“＞”“＜”或“＝”． 5四卤化硅SiX4的沸点和二卤化铅PbX2的熔点如图1所示． 结合SiX4的沸点和PbX2的熔点的变化规律可推断依FClBrI次序PbX2中化学键的离子性填“增强”“不变”或“减弱”下同共价性． 6碳的另一种单质C60可以与钾形成低温超导化合物晶胞结构如图2所示．此化合物可看成是K填充在C60形成的所有四面体间隙和八面体间隙之中其四面体间隙数目为．另有一种碱金属X相对原子质量为M与C60可形成类似化合物但X只填充C60形成的八面体间隙的一半此化合物的化学式为． 7如图3是晶体Fe3O4的晶胞该晶体是一种磁性材料能导电．解释Fe3O4晶体能导电的原因．
如图所示实线是一列简谐横波在t1时刻的波形图M是平衡位置距O点5m的质点虚线是t2＝t1+0.2s时刻的波形图．下列说法中正确的是
在做“练习使用多用电表”实验时某同学想测量多用电表内电源的电动势表盘上方正中刻度值为15他找到两块规格完全相同的多用电表和一个定值电阻设计实验方案如下 1首先将多用电表甲调到欧姆档“x1”倍率并进行欧姆调零测量出定值电阻阻值为10.0Ω 2保持多用电表甲档位不变将多用电表乙选择旋钮置于直流100mA档并与定值电阻串联如图甲所示则多用电表甲的红表笔应接填“a”或“b”接线柱黑表笔接另一接线柱 3该学习小组正确连接电路后观察用甲乙两表示数分别如图乙丙所示则乙表直流100mA挡的内阻为Ω多用电表内电源电动势E＝V．结果均保留两位有效数字
由相同金属电极及其不同浓度的盐溶液组成的电池称浓差电池电子由溶液浓度较小的一极流向浓度较大的一极．如图所示装置中X电极与Y电极初始质量相等．进行实验时先闭合K2断开K1一段时间后再断开K2闭合K1即可形成浓差电池电流计指针偏转．下列说法不正确的是
10分假如英语课上老师要求同桌之间交换修改作文请你修改你同桌写的以下作文.文中共有10处语言错误每句中最多有两处每处错误仅涉及一个单词的增加删除或修改. 增加在缺词处加一个漏字符号∧并在其下面写出该加的词. 删除把多余的词用斜线\划掉. 修改在错的词下划一横线并在该词下面写出修改后的词. 注意1每处错误及其修改均限一词. 2只允许修改10处多者从第11处起不计分. Johnwentshoppinginastoreandheforgottobringabag.Sohebuysashoppingbag.Afterarrivinghomeitoccurredhimthathecouldmakeabagbyusinghisoldtrousers.Severalhoursearlierhemadehimselfaverynicebag.Hismotherwasamazingatwhathehaddone.Avoidingspendingmoneyunnecessarilyisawayofsaving.Andmakingagooduseofthingsisanapproachtoprotecttheenvironment.What'smoreitishelpfulforyoutoimprovetheabilitytomakethingsbyhands.Itnotonlybringsuspleasurebutreducewastearoundus.
化学与生活息息相关下列有关说法正确的是
在四面体A﹣BCD中AB＝AC＝DB＝DC＝BC且四面体A﹣BCD的最大体积为则四面体A一BCD外接球的表面积为．
氢卤酸的能量关系如图所示下列说法正确的是
如图所示边长为l质量为m的等边三角形导线框用绝缘细线悬挂于天花板导线框中通一逆时针方向的电流．图中虚线过ab边中点和ac边中点．在虚线的下方有一垂直于导线框向里的匀强磁场．其磁感应强度大小为B此时导线框处于静止状态细线中的拉力为F1保持其他条件不变现将虚线下方的磁场移至虚线上方此时细线中拉力为F2．导线框中的电流大小为
8分TraditionallyrobotshavebeenhardmadeofmetalandotherrigidmaterialButateamofscientistsatHarvardUniversityintheUShasmanagedtobuildanentirelysoftrobot﹣onethatdrawsinspirationfromanoctopus章鱼. DescribedinsciencejournalNaturetheOctobotcouldpavethewayformoreeffectiveautonomousrobotsthatcouldbeusedinsearchrescueandexploration.TheOctobotisminimalsystemwhichmayserveasafoundationforanewgenerationofcompletelysoftautonomousrobotsthestudy'sauthorswrote. Robotsbuiltforpreciserepetitivemovementsinacontrolledenvironmentdon'tdosowellonroughterrains地形orinunpredictableconditions.Andtheyaren'tespeciallysafearoundhumansbecausethey'remadeoutofhardandheavypartsthatcouldbepotentiallydangeroustotheirusers. Soresearchershavebeenworkingonbuildingsoftrobotsfordecades.They'retakeninspirationfromnaturelookingtoanimalsfromjellyfishtocockroacheswhichareoftenmadeupofmoreflexiblematter. Butcreatingacompletelysoftrobotremainsachallenge.Evenifengineersbuildasilicone硅酮bodyit'sstillagrandchallengetoconstructflexibleversionsofessentialpartssuchasasourceofpower. Althoughsoftroboticsisstillinitsearlystageitholdsgreatpromiseforseveralapplicationssuchassearch﹣rescueoperationsandexplorationBarbaraMazzolaiandVirgilioMattolioftheItalianInstituteofTechnology'CenterforMicro﹣BioRoboticswroteinacomment.Softrobotsmightalsoopenupnewapproachestoimprovingwellnessandqualityoflife. 1What'sthespecialfeatureofOctobot? A.It'ssoft. B.It'smadeofmetal. C.It'sverysmall. D.Itlookslikeanoctopus. 2What'sthedisadvantageoftraditionalrobots? A.They'rehardtocontrol. B.They'retooheavytomove. C.Theycan'tpredictconditions. D.Theycan'tbehavewellallthetime. 3OneofthebiggestchallengesistobuildOctobot's. A.siliconebody B.complexcomponents C.precisemovements D.flexiblepowersource 4WhatcanweinferabouttheapplicationofOctobot? A.Ithasbeenusedinvariousfields B.Ithasnotbeenputintouseonalargescale. C.Ithasbeenusedinthefieldofrescue D.Ithasnotbeenimprovedyet.
如图所示ABC和ABD为两条光滑固定轨道ABE在同一水平面上CDE在同一竖线上D点距水平面的高度为h1＝3.2mC点距水平面的高度为h2＝5m一滑块从水平面上的A点以相同初速度分别沿两轨道滑行到C点或D点后水平抛出．取重力加速度g大小为10m/s2．求 1若从C点抛出时的水平射程与从D点抛出时相等滑块在A点的初速度大小 2若滑块在A点的初速度大小为10m/s调整轨道及C点的高度要求从C点抛出时水平射程最大则C点离地高度应为多少．
如图在矩形ABCD中AB＝3BC＝2点MN分别是边ABCD上的点且MN∥BC＝2．若将矩形ABCD沿MN折起使其形成60°的二面角如图 1求证平面CND⊥平面AMND． 2求直线MC与平面AMND所成角的正弦值．
25分假定你是某国际学校的学生李华你校学生会准备举行一次读书月活动.请你根据下面的提示用英语写一则书面通知并号召大家积极参与. 1活动目的丰富校园生活开阔学生视野提高学生阅读水平 2活动内容每人至少读三本书内容不限并写一篇读后感impressionsofafter﹣reading于四月三十日前交给学生会 3活动时间三月六日至四月五日. 注意 1词数100左右 2可以适当增加细节以使行文连贯. Dearfellowstudents.
NA表示阿伏加德罗常数的值下列说法中不正确的是
15分Carpoolingiswhenadriverofferstotakepassengersinexchangeforsomemoneyforpetrol.As1rsultcarpoolingcanbe2cheaphanpublictransportbecauseeverynoeinthecarsharesthecostofpetrol.I3recentdidcarpoolingforthefirsttimeanditwasveryeasytofindadriver.Iusedawebsite4listsdrivers'profiles简介andfoundsomeonewhowasgoingtothesameplaceasme.Alotofinformationcan5seeintheprofilessuchastheirfirstnameageandgender性别aswellasreviewsfromotherpassengers.Idecided6travelwithaladywhohadverygoodreviews. Ifoundcarpoolingtobean7impressexperience.Notonlywasthetripverycheapbutthedriverandtheotherpassengerswerereallyfriendly.TheywereallFrenchsoIhadthechancetopractise8speaksomeFrench.WhenIwavedgoodbyetothemathoughtsuddenlyoccurredtome9carpoolingcouldbethefutureoftravel.Bothdriversandpassengerscanbenefit10thisformoftravel.Itsavesmoneyandperhapsmoreimportantlycarpoolingprovidesafantasticopportunitytomeetinterestingpeopleonyourtravels.
在平面直角坐标系xoy中已知圆C1x+32+y﹣12＝4和圆C2x﹣42+y﹣52＝4 1若直线l过点A40且被圆C1截得的弦长为2求直线l的方程 2设P为平面上的点满足存在过点P的无穷多对互相垂直的直线l1和l2它们分别与圆C1和C2相交且直线l1被圆C1截得的弦长与直线l2被圆C2截得的弦长相等求所有满足条件的点P的坐标．
若sinα+＝则cos﹣α＝．
10分Youcan'thelpspendingmuchmoneyduringthefestivalseason.Howeverit'snotimpossibletosave.Herearesometipsyoucantaketopreventyourselffromoverspending. Surroundyourselfwithpeoplewhomakeyoufeelgood.There'sacommontrickplayedbytheadvertisingindustry1theadvertisingindustrytriestheirbesttoappealtoyouremotionsinordertomotivateyoutobuytheirproducts.Soinsteadoffallingintotheirmarketingtrapsurroundyourselfwiththepeopleyouloveandmakeyourselffeelgood. Don'tbuyanythinghot﹣heatedly.EverheardofthesayingAfoolandhismoneyaresoonparted?2. Considerrenting3.Afterallhowoftenwillyoubewearingthatnormaldress4.Whenitcomestoclothesyoushouldoftenpickouttheunused.SellingthemoneBayorCarousellcangiveyouextracashtogoshoppingwith. Remindyourselfofthethingsyouhave.Youmaynotknowaboutyourself.Everytimeyoulookatyourcloset壁橱andorganizeityoufindjusthowmanyitemsofclothingyouhave5. A.Sellitemsyoudon'tneed B.Ifyouareinabadmood C.Putawaytheclothesyoudon'twear D.Whenyouareattractedtobuycertainproducts E.Thispreventsyoufromwantingtogoshoppingevenmore F.Itwarnsyounottobeamanwhodoesn'tthinktwiceaboutpartingwithhismoney G.Rentingadressorabagforaspecialoccasioncouldactuallysaveyoumoremoney
如图1所示斜面体放在粗糙的水平地面上两斜面光滑且倾角分别为53°和37°两小滑块P和Q用绕过滑轮不可伸长的轻绳连接分别置于两个斜面上OP∥ABOQ∥AC已知PQ和斜面体均静止不动．若交换两滑块位置如图2所示再由静止释放斜面体仍然静止不动P的质量为m取sin53°＝0.8cos53°＝0.6重力加速度大小为g不计滑轮的质量和摩擦则下列判断正确的是
一定质量的理想气体从状态A依次经过状态BC和D后又回到状态A．其中C→D→A为等温过程．该循环过程如图所示下列说法正确的是
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