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如图,在正方形ABCD中,点A的坐标为(3,﹣1),点D的坐标为(﹣1,﹣1),且AB∥y轴,AD∥x轴. 点P是抛物线y=x2+2x上一点,过点P作PE⊥x轴于点E,PF⊥y轴于点F. (1)直...
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如图1正方形ABCD顶点A.B.在函数y=k﹥0的图像上点C.D.分别在x轴y轴的正半轴上当k的值改
如图在正方形ABCD中点A.在y轴正半轴上点B.的坐标为0﹣3反比例函数y=﹣的图象经过点C.1求点
在平面直角坐标系中正方形ABCD的位置如图所示点A.的坐标为10点D.的坐标为02.延长CB交x轴于
在直角坐标系中我们把横纵坐标都是整数的点叫做整点.且规定正方形的内部不包含边界上的点.观察如图所示的
64.
49.
36.
25.
如图正方形OEFG和正方形ABCD是位似形点F.的坐标为11点C.的坐标为42则这两个正方形位似中心
如图正方形ABCD的边长为4点A.的坐标为-11AB平行于x轴则点C.的坐标为__________.
在平面直角坐标系中正方形ABCD如图摆放点A.的坐标为﹣10点B.的坐标为02点D.在反比例函数y=
正方形ABCD在坐标系中的位置如图所示将正方形ABCD绕D.点顺时针旋转90°后B.点的坐标为
(-2,2)
(4,1)
(3,1)
(4,0)
正方形ABCD与正方形OEFG中点D.和点F.的坐标分别为﹣32和1﹣1则这两个正方形的位似中心的坐
正方形ABCD在坐标系中的位置如图所示将正方形ABCD绕D点顺时针旋转90°后B点的坐标为
(4,0)
(4,1)
(﹣2,2)
(3,1)
如图正方形ABCD和正方形OEFG中点
和点F.的坐标分别为 (3,2),(-1,-1),则两个正方形的位似中心的坐标是( )
A.(1,0)
(-5,-1)
(1,0)或(-5,-1)
(1,0)或(-5,-2)
在每个小正方形的边长为1的网格图形中每个小正方形的顶点称为格点.以顶点都是格点的正方形ABCD的边为
在平面直角坐标系中正方形ABCD的位置如图所示点A.的坐标为10点D.的坐标为02.延长CB交x轴于
在平面直角坐标系中正方形ABCD.的位置如图所示点A.的坐标为10点D.的坐标为03.延长CB交x轴
如图在正方形ABCD中E为CD边上一点以CE为对角线构造正方形CMEN点N在正方形ABCD内部连接A
如图正方形ABCD中对角线交于O.点正方形OMNQ与正方形ABCD的边长均为aDE=CF则两个正方形
正方形ABCD在平面直角坐标系中的位置如图所示已知A.点坐标04B.点坐标-30则C.点坐标____
如图正方形ABCD位于第一象限边长为3点
在直线y=x上,点A.的横坐标为1,正方形ABCD的边分别平行于x轴、y轴.若双曲线y=
与正方形ABCD有公共点,则k的取值范围为( )
A.1<k<9
2≤k≤34
1≤k≤16
4≤k<16
每个小方格都是边长为1个单位长度正方形ABCD在坐标系中的位置如图所示.1画出正方形ABCD关于原点
如图正方形ABCD和正方形OEFG中点C.和点F.的坐标分别为-321-1则两个正方形的位似中心的坐
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关于饱和汽与饱和汽压的概念下列说法正确的是
某学生对其30位亲属的饮食习惯进行了一次调查并用茎叶图表示这30人的饮食指数说明图中饮食指数低于70的人饮食以蔬菜为主饮食指数高于70的人饮食以肉类为主. 1根据茎叶图帮助这位学生说明两个年龄段亲属的饮食习惯 2根据以上数据完成下列2×2的列联表 3请用独立性检验知识分析“能否有99%的把握认为其亲属的饮食习惯与年龄有关” 参考公式及数据K2=n=a+b+c+d.
复数z=1+i2ii为虚数单位等于
Weightlossisahardtopic.Lotsofpeoplearen'tsatisfiedwiththeirpresentweightbutmostpeoplearen'tsurehowtochangeit.YoumaywanttolooklikethemodelsoractorsinmagazinesoronTVbutthosegoalsmightnotbehealthyorrealisticforyou.1Sowhatshouldyoudoaboutyourweightcontrol? 2Thebestwaytofindoutifyouareatahealthyweightorifyouneedtoloseorgainweightistotalktoadoctorordietitian营养学家.3Ifitturnsoutthatyoucanbenefitfromweightlossthenyoucanfollowafewofthesimplesuggestionslistedbelowtogetstarted. 4Peoplewholoseweightquicklybycrashdietingorotherextrememeasuresusuallygainbackallofthepoundstheylostbecausetheyhaven'tpermanentlychangedtheirhabits.Thereforethebestweightmanagementwaysarethosethatyoucanmaintainforalifetime. Smallchangesarealoteasiertostickwith坚持做thanlargeones.Tryreducingthesizeofwhatyoueat.5Onceyouhavethatdownstartgraduallyintroducinghealthierfoodsandexerciseintoyourlife. It'sagoodideatomaintainahealthyweightbecauseit'sjustthathealthy. A.Trygivingupregularsodaforaweek. B.Trytopayattentionasyoueatandstopwhenyou'refull. C.Weightmanagementisaboutlong﹣termsuccess. D.Besidesnomagicaldietwillmakeyoulooklikesomeoneelse. E.Beinghealthyisreallyaboutbeingataweightthatisrightforyou. F.Changingfromwholetononfatorlow﹣fatmilkisalsoagoodidea. G.Theywillcompareyourweightwithhealthystandardsandhelpyousetgoals.
以下是解决数学问题的思维过程的流程图 在此流程图中①②两条流程线与“推理与证明”中的思维方法匹配正确的是
下面说法正确的是
Whilegettingreadyforschooltodaymy16﹣year﹣olddaughtercameintomyroomtogivemeabighugandkiss.IaskedherWhatdoyouwant?ShesaidNothingMumyoualwaystellustohaveagooddaybeforeweleavethehousebutIwasthinkingaboutwhotellsyoutohaveagooddayandletsyouknowhowmuchyouareloved. Iamsotouchedbythecapacityofloveandunderstanding1comesfrommychildren.My15﹣year﹣oldsonaskedmelastnight2therewasawayforhimtogetasummerjobthisyearinordertohelpustopayourbills.Unfortunatelyinourareahe3be16. 4ofmychildrendependonmesomuchbecauseIamasingleparentbutjustwhenIpaythebillsthatIwillnotbeabletoprovideforthemtheycomeupwithways5helpout.IcompletelyunderstandthatIwillstillhavetofindawaytopaythebillsasIdonotwantmychildrentotakeupanything.Butfornowthefact6theyhavesteppedupandofferedtohelpwithoutanyoneasking7touchme. WhenmydaughterwastwoIrememberrushingtogettoworkgettingtothefrontdoorandaskinghertohurryupandcome.Thensheappearedatthedoor8abagthatshewasholdingopen.IsaidWedon'thavetimeforthis.ShestoppedmeandsaidFillitwithloveMum.Ifelltomykneesandhuggedherandthenkissedher.FromthenonshewouldbringthebagandIwouldbringthelovetothedoorbefore9leaveforschoolandwork.
WhilemanycountrieslovetheirteaUKcitizensareparticularlyproudofbeingteapeople.TheaverageUKcitizenconsumesnearly2kilogramsofteaeachyear. TeaonlymadeitswaytoEnglandinlargequantitiesinthefirstyearsofthe17thcentury.TeafromChinaandafewotherAsiancountrieswasbeingsoldmorewidelyinEnglandatthattime.Thenteawasgettingmoreandmorepopularamongdifferentsocialclasses. Therearemanyvarietiesoftea.BlackteamixturesarestillthemostcommontypedrunkintheUK.Blackteaisdarkincolourbecausetheleaveshavebeenallowedtooxidize氧化beforedrying.Thisiswhyweusuallyserveitwithmilkalthoughitisnotuncommontodrinkitblackorwithlemon.Youmaystillfindteamadewithloosetealeavesservedupinapotandpouredintothebestchinacupswithsaucers茶托forvisitors. TeaisstillalargepartofdailylifeintheUKtodaybutitseemstobeonthedecrease.TheamountofteasoldintheUKfellbymorethan10%inthefiveyearsleadingupto2002andhasbeendroppingeversince.Teasalesfellby6%in2014aloneandmostrestaurantsreportsellingmorethantwiceasmanycupsofcoffeeastheydotea.Morethan£1billionwasspentoncoffeeinhighstreetstoresin2013morethantwicewhatwasspentonteabags. Stillwhatgoesaroundcomesaroundit'ssuretobecomefashionableagain. 1Whichofthefollowingistrueaccordingtothefirstthreeparagraphs? A.TeamadeitswaytoEnglandintheearlyyearsofthe16thcentury. B.TheUKusuallyservesblackteawithlemon. C.TeafromChinawasbeingsoldmorewidelyinEnglandnow. D.UKcitizenstakeprideinbeingteapeople. 2Whatcanweinferfromthefourthparagraph? A.Teasalesfellby6%in2014alone. B.Since2002thesalesofteahasbeenonthedecrease C.In2013themoneyspentonteawas£3billion D.Mostrestaurantlikesellingteathancoffee. 3Whatdoestheunderlinedsentencemeaninthelastparagraph? A.Itcanneversucceedagain B.Theteacanbecomepopularagain C.Coffeeismorepopularthantea D.Theteaisbecominglesspopular 4Whatistheauthor'spurposeinwritingthetext? A.TointroduceteaintheUK B.Toshowtheauthor'spreferencefortea C.Tointroducethefunctionsoftea D.TocompareteainChinaandUK
一根中点有固定转动轴的轻质杆长为2l两端固定完全相同的质量为m电荷量为+q的小球1和2装置放在如图所示的关于竖直线对称的电场中.开始时杆在水平位置静止现给小球1一个竖直向上的速度让小球12绕转动轴各自转动到BA位置AB间电势差是U小球12构成的系统动能减小量是
如图a所示某同学利用下图电路测量电源电动势和内阻.先将电路中的电压传感器d端与a端连接. 1若该同学开始实验后未进行电压传感器的调零而其他器材的使用均正确则移动滑片后得到的U﹣I图最可能为图b 2将电压传感器d端改接到电路中c端正确调零操作移动滑片后得到如图c所示的U﹣I图已知定值电阻R=10Ω则根据图象可知电源电动势V内阻Ω.
如图所示在水平向右的匀强电场中直细杆倾斜放置一个质量m=2kgq=0.1C的带正电小球穿在细杆上.细杆与水平面之间的倾角θ=37°小球与细杆间的动摩擦因数μ=0.5从t=0时刻开始物体运动的与时间t的关系图象所示x为位移t=2s时撤去电场g=10m/s2sin37°=0.6cos37°=0.8求 1电场强度E的大小 2物体向上运动过程中距计时点的最大距离 3物体由斜面最高点返回计时点的时间.结果可以保留根号
已知函数fx=|2x-4|+|x+1|x∈R. 1解不等式fx≤9 2若方程fx=-x2+a在区间[02]有解求实数a的取值范围.
某超市为了解气温对某产品销售量的影响随机记录了该超市12月份中5天的日销售量y单位千克与该地当日最低气温x单位°C的数据如表所示 1求y关于x的线性回归方程=x+精确到0.001 2判断y与x之间是正相关还是负相关若该地12月份某天的最低气温为6°C请用1中的回归方程预测该超市当日的销售量. 参考公式b==a=-b. 参考数据xiyi=2×12+5×10+7×9+9×8+12×6=281=22+52+72+92+122=303.
已知实数ab满足2a+b=2则4a+2b的最小值为.
Whileresidentsofwealthynationstendtohavegreaterlifesatisfactionnewresearchshowsthatthoselivinginpoorernationsreporthavinggreatermeaninginlife. ThesefindingspublishedinPsychologicalScienceajournaloftheAssociationforPsychologicalsciencesuggestthatmeaninginlifemaybehigherinpoorernations1greaterreligiosity笃信zōng jiāo .Ascountriesbecomericherreligionbecomesless2topeople'slivesandtheyloseasenseofmeaninginlife. Thusfarthewealthofnationshasbeenalmostalways3longevityhealthhappinessorlifesatisfactionexplainspsychologicalscientistShigehiroOishioftheUniversityofVirginia.Giventhatmeaninginlifeisanimportantaspectofoverallwell﹣beingwewantedtolookmorecarefullyatdifferential4correlates相关物andpredictorsformeaninginlife. OishiandcolleagueEdDieneroftheUniversityofIllinoisatUrbana﹣Champaign5lifesatisfactionmeaningandwell﹣beingbyexaminingdatafromthe2007GallupWorldPolla6surveyofover140000participantsfrom132countries.7answeringabasiclifesatisfactionquestionparticipantswereaskedDoyoufeelyourlifehasanimportant8ormeaning?andIsreligionanimportantpartofyourdailylife? Thedatarevealedsomeunexpected9 AmongAmericansthosewhoarehighinlifesatisfactionarealsohighinmeaninginlifesaysOishi.Butwhenwelookedatthesocietallevelofanalysiswefoundacompletely10patternoftheassociationbetweenmeaninginlifeandlifesatisfaction. WhenlookingacrossmanycountriesOishiandDienerfoundthatpeopleinwealthiernationsweremoreeducatedhadfewerchildrenandexpressedmoreindividualisticattitudescomparedtothoseinpoorercountries﹣allfactorsthatwereassociatedwithhigherlifesatisfactionbuta11lowersenseofmeaninginlife. ThedatasuggestthatreligiositymayplayanimportantroleResidentsofwealthiernationswherereligiosityislowerreported12meaninginlifeandhadhighersuicideratesthanpoorercountries. Accordingtotheresearchersreligionmayprovidemeaningtolifetotheextentthatit13peopletoovercomepersonaldifficultyandcopewiththestrugglesofworkingtosurviveinpooreconomicconditions OishiandDienerhopetoreproducethesefindingsusingmorecomprehensivemeasuresofmeaningandreligiosityandareinterestedin14countriesovertimetotrackwhethereconomic15givesrisetolessreligiosityandlessmeaninginlife. 1A.bymeansof B.asaresultof C.forthesakeof D.withregardto 2A.central B.ideal C.formal D.superior 3A.relatedwith B.combinedwith C.associatedwith D.representedwith 4A.models B.styles C.designs D.patterns 5A.investigated B.diagnosed C.explored D.exploited 6A.nationwide B.thorough C.complete D.large﹣scale 7A.Exceptfor B.Insteadof C.Ratherthan D.Inadditionto 8A.opportunity B.temptation C.purpose D.definition 9A.trends B.practices C.outlooks D.currents 10A.precious B.similar C.relevant D.different 11A.exactly B.significantly C.adequately D.partially 12A.better B.less C.more D.fewer 13A.allows B.requests C.reminds D.helps 14A.following B.chasing C.pursuing D.predicting 15A.priority B.profit C.prosperity D.potential
FeaturedLasVegasHotels 1Wherecanfindthisinformation? A.Thetravelagency'sleaflet B.TheGlobalTravelerMagazine C.www.USAtour.com D.Advertisement 2Whichofthefollowingisnottrue? A.CircusCircusisthecheapestoneamongthefourhotels. B.LivinginVenetianResortHotelCasinoenablesyoutotraveltoVeniceforfree. C.Emmanuel.Mwasquitesatisfiedwithboththeenvironmentandthelocationofthehotelhelivedin. D.LuxorHotelandCasinohasaveryspecialappearance. 3Ifyoucarealotabouttheservicebuthaveatightbudgetwhichhotelwillyouchoose? A.LuxorHotelandCasino B.VenetianResortHotelCasino C.CircusCircusHotelandCasino D.PalaceStationHotel
在如图所示宽度范围内用电场强度为E的匀强电场可使初速度是v0的某种正粒子偏转θ角.在同样宽度范围内若改用方向垂直于纸面向外的匀强磁场匀强磁场的磁感应强度为B使该粒子穿过该区域并使偏转角也为θ不计粒子的重力.则
有两个处于基态的氢原子ABA静止B以速度v0与之发生碰撞.碰撞后二者的速度vA和vB在一条直线上碰撞过程中部分动能有可能被某一氢原子吸收从而使该原子由基态跃迁到激发态然后此原子向低能态跃迁并发出光子.下列说法正确的是
已知函数fx=x+sinx+1且fa=3则f-a=.
2019年4月10日天文学家宣布首次直接拍摄到黑洞的照片.在宇宙空间假设有一个恒星和黑洞组成的孤立双星系统黑洞的质量大于恒星的质量它们绕二者连线上的某点做匀速圆周运动双星系统中的黑洞能“吸食”恒星表面的物质造成质量转移且两者之间的距离减小它们的运动轨道近似可以看成圆周则在该过程中
一列波沿x轴方向传播某一时刻的波形如图所示.质点A与坐标原点O的水平距离为0.6m波长λ=1.6m此时质点A沿y轴正方向振动经过0.1s第一次到达波峰处则下列说法中正确的是
Someoftheworld'smostsignificantproblemsneverhitheadlines.Oneexamplecomesfromagriculture.Foodriots暴乱andhungermakenews.Butthetrendlyingbehindthesemattersisrarelytalkedabout.Thisisthedeclineinthegrowthinyields产量ofsomeoftheworld'smajorcrops.AnewstudybytheUniversityofMinnesotaandMcGillUniversityinMontreallooksatwhereandhowfarthisdeclineisoccurring. Theauthorstakeavastnumberofdatapointsforthefourmostimportantcropsricewheatcornandsoybeans.Theyfindthatonbetween24%and39%ofallharvestedareastheimprovementinyieldsthattookplacebeforethe1980ssloweddowninthe1990sand2000s. Therearetwoworryingfeaturesoftheslowdown.Oneisthatithasbeenparticularlysharpintheworld'smostpopulouscountriesIndiaandChina.Theirabilitytofeedthemselveshasbeenanimportantsourceofrelativestabilitybothwithinthecountriesandonworldfoodmarkets.Thatself﹣sufficiencycannotbetakenforgrantedifyieldscontinuetoslowdownorreverse. Secondyieldgrowthhasbeenlowerinwheatandricethanincornandsoybeans.Thisisproblematicbecausewheatandricearemoreimportantasfoodsaccountingforaroundhalfofallcaloriesconsumed.Cornandsoybeansaremoreimportantasfeedgrains.Theauthorsnotethatwehavepreferentiallyfocusedourcropimprovementeffortsonfeedinganimalsandcarsratherthanoncropsthatfeedpeopleandarethebasisoffoodsecurityinmuchoftheworld. Thereportqualifiesthemoreoptimisticfindingsofanothernewpaperwhichsuggeststhattheworldwillnothavetodigupalotmorelandforfarminginordertofeed9billionpeoplein2050astheFoodandAgricultureOrganizationhasargued. Insteaditsaysthankstoslowingpopulationgrowthlandcurrentlyploughedupforcropsmightbeabletoreverttoforestorwilderness.Thiscouldhappen.Thetroubleisthattheforecastassumescontinuedimprovementsinyieldswhichmaynotactuallyhappen. NoteAnswerthequestionsorcompletethestatementsinNOMORETHANTWELVEWORDS. 1Thetrendlyingbehindfoodriotandhungeris. 2WhydoestheauthormentionIndiaandChinainparticular? 3Accordingtothenewstudywhat'stheproblemoftherecentcropimprovementefforts? 4Whatistheauthor'sattitudetotheargumentoftheFoodandAgricultureOrganization?
Iwon'tcallmyselfthemostaccomplishedpersonwhenitcomesto1holdchopsticks.InfactI'mprettysurethatmytechniquelooksclumsyattimes.Itendtohold2Iinthemiddlemorebeginnerthanexpert. StillsinceIeatalmosteverymealwiththeeatingutensil器皿ofchoiceinChinait'snotuncommonforanewfriendoracquaintancetocometoasimple3concludeafterobservingmethatmyChinesehusbandJunmust4showmehowtousethem. Theyarewrong.I'veusedchopstickseversinceIwasateenageratimewhenmysisterandmotherwerebothfondofChinesecuisineandintroducedme5manynewdishesalongwiththe6preferutensilsinChina.Wealwayskeptbamboochopsticksalongwithour7knifeforksandspoonsreadyforwheneverwehappenedtohaveChinesefoodfordinner.Itwasmyclosestfamily8observedmyfirstmistakesImadeinusingchopsticks. PlusIlivedovertwoyearsinChinabeforeJunandIstarteddatingandI9expecttousechopsticksinalmosteveryrestaurantstandandbar.Trustmewhenyou'rehungryyoufigureoutprettyfastwhatittakestodown咽下10mealwiththeseutensils.
已知全集U={013568}集合A={158}B={2}则∁UA∪B=
“∵四边形ABCD为矩形∴四边形ABCD的对角线相等”补充以上推理的大前提为
下列说法正确的是
Low﹣CostGiftsforMother'sDay GiftNo.I Offertobeyourmother'shealthfriend.Promisetobethereforanyandalldoctor'svisitswhetheradiseaseoraregularmedicalcheck﹣up.Mostmothersalwayssaynoneedbutanothersetofeyesandearsisalwaysagoodideaatadoctor'svisit.Thebestpart?Thisoneisfree. GiftNo.2 Helpyourmotherorganizeallofhermedicalrecordswhichincludethetestresultsandmedicalinformation.Putthemallinoneplace.Besuretomakealistofallofhermedicinesandwhattimesshetakesthem.Havingallthisinformationinoneplacecouldendupsavingyourmother'slifeDr.MarieSavardsaid. GiftNo.3 Enoughsleepisconnectedtogeneralhealthconditions.BuyyourmothercottonsheetsandcomfortablepillowstoencouragebettersleepSavardsaid.Weknowthatgoodsleepisveryimportanttoourhealth. GiftNo.4 SomegiftcompaniessuchasPresentsforPurposeallowyoutopayitforwardthisMother'sDaybypickinggiftsinwhich10percentofthepriceyoupaygoestoacharity慈善机构.Giftgiverscanchoosefromawidevarietyofusefulbutinexpensivethings﹣manyofwhicharegreen﹣andthenchooseameaningfulcharityfromalist.Whenyourmothergetsthegiftshewillbetoldthatshehashelpedthechosencharity. 1Whatareyouadvisedtodoforyourmotheratdoctor'svisits? A.Givehergifts. B.Buymedicine. C.Bewithher. D.Takenotes. 2Whatcanbeagiftoforganizationforyourmother? A.Keepinghermedicalinformationtogether. B.Buyingallgiftsforherfromonecompany. C.Makingalistofhermedicalcheck﹣ups. D.Storinghermedicinesinasafeplace. 3BuyinggiftsfromPresentsforPurposeallowsmothersto A.bewell﹣organized B.enjoygoodsleep C.giveothershelp D.getextrasupport
已知全集U=R.集合A={x|1≤x≤3}集合B={x|3x>9}. 1求∁UB∪A 2若集合C={x|a<x≤a+1}且集合A与集合C满足C∩A=C求实数a的取值范围.
已知函数fx是定义域为[-33]的奇函数当-3≤x≤0时fx=x2-2x那么不等式fx+1>f3-2x的解集
观察下列各式a+b=1a2+b2=3a3+b3=4a4+b4=7a5+b5=11…则a7+b7=
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高一下学期数学
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