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（x3﹣）7的展开式中x9的系数是 （用数字作答）
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高二下学期数学《》真题及答案
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已知点P是圆F1x﹣12+y2＝8上任意一点点F2与点F1关于原点对称线段PF2的垂直平分线分别与PF1PF2交于MN两点． 1求点M的轨迹C的方程 2过点G0的动直线l与点的轨迹C交于AB两点在y轴上是否存在定点Q使以AB为直径的圆恒过这个点若存在求出点Q的坐标若不存在请说明理由．
已知点A12B31C22D1m 1若向量∥求实数m的值 2若m＝3求向量与的夹角
若函数fx＝x﹣sin2x+asinx在﹣∞+∞单调递增则a的取值范围是
在平面直角坐标系xOy中直线l的参数方程为t为参数0≤α＜π．以坐标原点为极点x轴的正半轴为极轴建立极坐标系．已知曲线C的极坐标方程为ρcos2θ＝4sinθ． Ⅰ求直线l的普通方程与曲线C的直角坐标方程 Ⅱ设直线l与曲线C交于不同的两点AB若|AB|＝8求α的值．
已知等比数列{an}且a6+a8＝4则a8a4+2a6+a8的值为
8分Thefirstlighthouses灯塔inAmericawhichwerebuiltinthe1710susedwoodorcoalasfuel.Bythemid﹣1700﹩Americanlighthousesbegantouseoil﹣burninglamps.Thelampswerelitandthenplacedinahighplacesotheycouldbeseenfromgreatdistances. Thetroublewithusingoillampswasthatonlyasmallpercentageofthelightproducedbythelampcouldbeseenfromthesea.Increasingtheamountoflightmeantburningmorefuelwhichrequiredbringingmoreoiltothelighthouse.Thiswasadifficultjobforthelighthousekeeper. Manyinventorstrieddifferentwaystoincreasethebrightnessofthelightfromoillamps.Bytheearly1800sAmericanlighthousesusedArgandlamps.Aircomingfromthebaseofthislampmadethelightbrighter.WiththeadditionofareflectortheArgandlampbecamestandardinAmericanlighthousesuntilthe1850s.Shipsfifteenmilesawaycouldseethelightonaclearnight. In1819theFrenchgovernmentaskedscientistAugustin﹣JeanFresneltoworkondirectingmorelighttowardships.Fresnelwhostudiedprisms棱镜beganworkingonaspeciallens透镜thatusedmanyprisms.Fresnelwasabletosend80percentofthelightsoshipscouldseethelightfromtwentymilesaway!ThenewlenswasnamedtheFresnellens.Americabegantousethenewlensinthe1850s. Overtheyearssourcesoflightcontinuedtochange.Bythe1870slighthousesbegantousekerosenefuelandin1886electricitywasfirstused.Bythe1990smanylighthousesstartedtousesolarpower.Electricityisstillusedinlighthousestodaybutitisusuallyproducedbysolarpower. 1Whatwasadisadvantageoftheoil﹣burninglamp? A.Itmightresultinfire. B.Itwasnotbrightenough. C.Itdidnotworkwellinbadweather. D.Itmightcauseharmtolighthousekeepers. 2Whatlampdoesthefollowingpictureshow? A.Alampusedinthemid﹣1700s. B.AlampwiththeFresnellens. C.Amodernoillamp. D.AnArgandlamp. 3WhatdoweknowabouttheFresnellens? A.ItwasfirstusedinAmerica. B.Itwasabletosendallthelight. C.Itwasnamedafteraprismexpert. D.Itwasanunsuccessfulinvention. 4Whatisthetextmainlyabout? A.ThetechnologyinAmericanlighthouses. B.Theimportantroleoflighthouses. C.FamouslighthousesinAmerica. D.Somegreatinventionsoflight.
6分TheopeningtimesofVienna'smuseumsshopsTouristInfoViennaetc TouristInfo 1stdistrictcitycentre AlbertinaplatzcornerofMaysedergasse Dailyfrom900amto700pm ViennaInternationalAirportArrivalHall Dailyfrom700amto1100pm Museums MostofVienna'smuseumsareopendaily.SomeareclosedonceaweekofteneitheronMondayorTuesday.Thedailyopeningtimesvaryfrommuseumtomuseumbutyoucangenerallyassumethatamuseumwillbeopenbetween1000amand500pm.Someofthelargemuseumsofferartloversonelateeveningperweekandstayopenuntil800pmor900pm. Shops InViennashopsareusuallyopenfromMondaytoFridayfrom900amto630pmandonSaturdayuntil500pmor600pm.Someshoppingcentersareopenuntil800pmor900pmfromMondaytoFriday. Banks MostbanksinViennaareopenfromMondaytoFridayfrom800amto1230pmandfrom130pmto300pmanduntil530pmonThursdays.Inthecitycenteralmostallbanksareopenoverlunchtime. Restaurantsandhotfood Mostrestaurantsinthecitycenterareopendaily.Hotfoodisgenerallyofferedfrom1100amto200pmandfrom600pmto1000pm.SomerestaurantsoftenoutsidethecitycenterareclosedononedayeachweeksometimesonSundaysaswell. 1AccordingtothepassagewhencanartloversvisitsomemuseumsinVienna? A.At600pm B.At900am C.At800am D.At1000pm 2Youcandothefollowingat400pmonThursdaysEXCEPT. A.goshopping B.visitthemuseum C.eatahotmealinarestaurant D.drawsomemoneyatthebank 3Thetextisprobablywrittenfor. A.socialorganizations B.governmentofficials C.thelocals D.tourists
如图所示abef是固定在绝缘水平桌面上的平行光滑金属导轨导轨足够长导轨间距为d．在导轨abef间放置一个阻值为R的金属导体棒PQ．其质量为m长度恰好为d．另一质量为3m长为d的金属棒MN也恰好能和导轨良好接触起初金属棒MN静止于PQ棒右侧某位置盛个装置处于方向垂直桌面向下磁感应强度大小为B的匀强磁 场中．现有一质量为m带电荷量为q的光滑绝缘小球在桌而上从O点O为导轨上的一点以与可成60°角的方向斜向右方进人磁场随后小球垂直地打在金属ドMN的中点小球与金属棒MN的碰撞过程中无机械能损失不计导轨间电场的影响不计导轨和金属棒MN的电阻两杆运动过程中不相碰求 1小球在O点射人磁场时的初速度V0． 2金属棒PQ上产生的热量E和通过的电荷量Q． 3在整个过程中金属棒MN比金属棒PQ多滑动的距离． 4请通过计算说明小球不会与MN棒发生第二次．
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两端封闭的玻璃管竖直放置长为l＝10cm的水银柱将管内的空气分为两部分上下空气柱的长度分别为l1＝12cm和l2＝18cm初始时上面空气压强为15cmHg现玻璃管以a＝0.5g的加速度竖直向上加速上移设温度始终不变求稳定时水银上面空气柱的长度．
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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.
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．
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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
已知两条直线ab与两个平而αβ给出下列命题 ①若a⊂α．b⊂β．α∥β则a∥b②若a⊂αb⊂βa∥βb∥α则α∥β ③若a⊥αb⊥βα∥β则a∥b④若α⊥βa∥αb∥β则a∥b 其中正确的命题个数为
在△ABC中点D在边BC上若则＝
如图所示一横截面为等腰三角形的玻璃砖底角θ＝30°底边BC长为2aAD与BC垂直O为BD中点．一细光束平行于AB边从O点射入玻璃砖．已知玻璃砖的折射率n＝真空中光速为c．求 i光束的出射位置与O点的距离 ii光束在玻璃砖中传播的时间．
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