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椭圆的长轴长为10，其焦点到中心的距离为4，则这个椭圆的标准方程为（ ）
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高二上学期数学《》真题及答案
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已知椭圆G的中心在坐标原点长轴在x轴上离心率为且G上一点到G的两个焦点的距离之和为12则椭圆G的方程
椭圆短轴的一个端点与两个焦点组成一个正三角形焦点到椭圆长轴端点的最短距离为求此椭圆的标准方程．
已知椭圆G.的中心在坐标原点长轴在x轴上离心率为且椭圆G.上一点到其两个焦点的距离之和为12则椭圆G
直线l经过椭圆的一个顶点和一个焦点若椭圆中心到l的距离为其短轴长的则该椭圆的离心率为．
已知椭圆的中心为坐标原点O.椭圆短半轴长为1动点M2tt>0在直线x＝a为长半轴c为半焦距上.1求椭
若椭圆的短轴长为6焦点到长轴的一个端点的最近距离是1则椭圆的离心率为________
椭圆的中心在原点焦点在坐标轴上焦距为．一双曲线和该椭圆有公共焦点且双曲线的实半轴长比椭圆的长半轴长
点A.B.分别是以双曲线的焦点为顶点顶点为焦点的椭圆C.长轴的左右端点点F.是椭圆的右焦点点P.在椭
椭圆的焦点在y轴上一个焦点到长轴的两端点的距离之比是1∶4短轴长为8求椭圆的标准方程
已知椭圆C.的中心在坐标原点焦点在x轴上椭圆C.上的点到焦点距离的最大值为3最小值为1.求椭圆C.的
若中心在原点焦点在x轴上的椭圆的长轴长为18且两个焦点恰好将长轴三等分则此椭圆的方程是
已知椭圆G.的中心在坐标原点长轴在x轴上离心率为且G.上一点到G.的两个焦点的距离之和为12则椭圆G
若椭圆上的点到其一个焦点的距离的最小值为最大值为则该椭圆的短轴长为.
已知椭圆中心在原点焦点在x轴上长轴长等于12离心率为.1求椭圆的标准方程2过椭圆左顶点作直线l若动点
设椭圆C1的离心率为焦点在x轴上且长轴长为26.若曲线C2上的点到椭圆C1的两个焦点的距离的差的绝对
2016年·上海黄浦区二模若椭圆上的点到焦点的距离的最小值为5最大值为15则椭圆的短轴长为．
一个椭圆的中心在原点焦点在x轴上右焦点到短轴端点的距离为2到右顶点的距离为1它的标准方程是.
自椭圆上任一点到两定点的距离之和为一常数即等于椭圆的
中心轴
短轴
长轴
弧长
已知椭圆G.的中心在坐标原点焦点在x轴上离心率为且椭圆G.上一点到椭圆G.的两个焦点的距离之和为12
已知椭圆中心在原点焦点在x轴上长轴长等于12离心率为.Ⅰ求椭圆的标准方程Ⅱ过椭圆左顶点作直线l若动点
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根据要求完成下列实验．ab为弹餐夹其他装置略去 ①验证SO2具有氧化性还原性和酸性氧化物的通性． 1连接仪器检查装置气密性加药品后打开b关闭a然后滴入浓硫酸加热．装有浓硫酸的仪器名称是铜与浓硫酸反应的化学方程式是． 2能验证SO2具有氧化性的实验现象是． 3装有BaCl2溶液的试管中无任何现象将其分成两份分别滴加氨水和氯水均产生白色沉淀沉淀的化学式分别是．写出其中SO2显示还原性并生成白色沉淀的总的离子方程式． 4能验证SO2具有酸性氧化物的通性的实验现象是若通入过量的SO2其化学方程式是． ②验证酸性的相对强弱碳酸＞次氯酸．已知酸性亚硫酸＞碳酸 5打开a关闭b．装置A中的足量的试剂是．利用该装置能否判断碳酸的酸性比次氯酸强理由是．
芬太尼结构式如图是一种强效的类阿片止痛剂起效迅速而作用时间极短．当它与药物联合使用时通常用作疼痛药物或麻醉剂．下列说法正确的是
乙烯是一种重要的工业原料．下列关于乙烯的说法正确的是
硫酸亚铁铵[NH42SO4•FeSO4•6H2O]是透明浅蓝绿色晶体易溶于水而不溶于酒精等有机溶剂在空气中一般比较稳定不易被氧化．制备步骤如下 步骤1．称取还原铁粉0.4g炭粉0.3g放入50mL锥形瓶中加入3.5mL2mol•L﹣1硫酸置于60℃热水浴中加热如下左图待反应完全取出冷却再加入6mol•L﹣1的硫酸2mL． 步骤2．在上述反应液中加入浓氨水0.8mL振荡混匀抽滤如上右图．向滤液中加入10mL无水乙醇静置大量晶体析出倾析再次抽滤． 步骤3．取出晶体用干净的滤纸吸干称量并分析样品． 请回答下列问题 1步骤1中加入还原铁粉同时加入炭粉的作用是 2加入6mol•L﹣1硫酸的作用是． 3产品中金属阳离子的检验方法及现象． 4称取获得的硫酸亚铁铵[NH42SO4•FeSO4•6H2O]摩尔质量为392g•mol﹣11.9600g配成100mL溶液取出20.00mL滴加稀H2SO4酸化后用0.0100mol•L﹣1KMnO4标准溶液进行滴定消耗KMnO4溶液为18.00mL． 下列有关滴定的操作正确的是填字母编号． a．滴定过程中眼睛注视滴定管中液面变化 b．滴定前用蒸馏水润洗滴定管 c．读数过程中保持滴定管自然悬垂 d．读数时视线与刻度线凹液面最低处切线相平齐 滴定过程中Fe2+与酸化的KMnO4溶液反应生成Fe3+Mn2+H2O的反应离子方程式为制得硫酸亚铁铵样品的纯度为．
Whileweatherforecasterscanmakefairlyaccuratepredictionsthere'salwaystheriskyou'llbecaughtoutwhiledrivingintherain.ButthedaysofhavingtoquicklycloseyoursunroofcouldsoonbeathingofthepastthankstoJaguarLandRovefslatesttechnology.Thefirmisdevelopingcarsthatcanadaptautomaticallybyclosingwindowsandroofsorstartingtheheateriftheydetectbadweatherisontheway.Theweatherforecastingsystemusesasetofairpressurehumidity湿度andlightsensors传感器tohelpitsvehiclespredictchangesinconditionsandadapttothem.Carsequippedwiththesystemcouldmakeslightchangestotheairconditioningifitfindstheweatherisgettingwarmerduringajourneyorincreasethecabintemperatureifitwillgetcolder. Theforecastmayindicatethereisapossibilityofoneormoreweatherconditionssuchasrainwithinaperiodoftimesuchasfiveminutes.Thevehiclemaythenadapttothelocalweatherconditions.Inparticularitmaycloseoneormorewindowsorclosearoofofthevehicleinresponsetoaforecastbeingasignofrain.Similarlywindowscouldbedarkenedusingelectrochromic电致变色的glasstoimprovevisibilityifbrightsunshineisforecast. Althoughitsunclearwhetherthistechnologywillmakeitswaytoaproductionvehicleanytimesoonsuchasystemwouldbeadvantageousonautonomousvehicles.Sincethere'snohumandriverpresentthesystemwillallowthevehicletomakeitcomfortableforitspassengersbasedoncurrentweatherconditions.Itcanalsomakethevehiclesaferifitknowsrainorsnowiscoming. 1HowwillJaguarLandRovefslatesttechnologybenefitdrivers? A.Vehiclescanautomaticallydrivethemselves. B.Vehiclescanfindpositionsandroutesthemselves C.Vehiclescanactasmobileweatherforecastingstations. D.Vehiclescanopenwindowsandsunroofsautomatically. 2Whatisthefeatureoftheglassofavehiclewiththenewtechnology? A.Itcanhelpadjustthetemperature. B.Itcanstillbeclearinrainydays. C.Itistoostrongtobreakintopieces. D.Itscolourcanchangewiththesunshine. 3Whatcanweknowabouttheweatherforecastingsystemfromthetext? A.Itisintelligentenoughtostopraining. B.Itmakesthedrivermorecomfortable. C.Itcan'tpredicttheweatheraccurately. D.Itmakesautonomouscarssaferinbadweather. 4Wheremightthetextbetakenfrom? A.Abookreview. B.Asciencereport. C.Asciencefiction. D.Atravelbrochure.
下列实验中现象及结论都正确且二者之间有因果的是
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