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三角形三边长为6、8、10，则这个三角形的面积是 ．
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三角形的三边长分别为345求这个三角形的面积.
三角形两边长分别为2和8若该三角形第三边长为奇数则该三角形的第三边为.
若三角形三边长分别是456则这个三角形的形状是
锐角三角形
直角三角形
钝角三角形
不能确定
一个三角形的三边长分别是12cm16cm20cm则这个三角形的面积是__
三角形的三边长为则这个三角形是
） 等边三角形 （
） 钝角三角形 （
） 直角三角形 （
） 锐角三角形.
三角形的两边长为2和4第三边长是方程x2-6x+8=0的根则这个三角形的周长是
以半径为1的圆内接正三角形正方形正六边形的边长为三边作三角形则
这个三角形是等腰三角形
这个三角形是直角三角形
这个三角形是锐角三角形
不能构成三角形
测得一个三角形的三边长为51213则这个三角形的面积为
三角形的三边长为abc且满足a+b2=c2+2ab则这个三角形是
等边三角形
钝角三角形
直角三角形
锐角三角形
已知三角形两边长为2和6要使这个三角形为直角三角形则第三边的长为
若一个三角形的三边长分别是68a如果这个三角形是直角三角形则a2=
若一个三角形的三边长分别为6810则这个三角形最长边上的中线长为
3.6
4
4.8
5
已知三角形三边长分别是6810则此三角形的面积为
三角形的三边长为abc且满足a+b2=c2+2ab则这个三角形是
等边三角形
钝角三角形
直角三角形
锐角三角形
若一个三角形的三边长分别是68a如果这个三角形是直角三角形则a2＝__________.
测得一个三角形的三边长为51213则这个三角形的面积为平方单位.
有一个三角形两边长是610要使这个三角形成为直角三角形则第三边是__________.
若一个三角形的三边长分别为6810则这个三角形最长边上的中线长为
3.6
4
4.8
5
三角形的三边长为则这个三角形是
） 等边三角形 （
） 钝角三角形 （
） 直角三角形 （
） 锐角三角形.
若一个三角形的三边长分别为6810则这个三角形中最短边上的高为______.
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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
我总是对那些在我失意时安慰我的人心存感激.grateful
Whilegettingreadyforschooltodaymy16﹣year﹣olddaughtercameintomyroomtogivemeabighugandkiss.IaskedherWhatdoyouwant?ShesaidNothingMumyoualwaystellustohaveagooddaybeforeweleavethehousebutIwasthinkingaboutwhotellsyoutohaveagooddayandletsyouknowhowmuchyouareloved. Iamsotouchedbythecapacityofloveandunderstanding1comesfrommychildren.My15﹣year﹣oldsonaskedmelastnight2therewasawayforhimtogetasummerjobthisyearinordertohelpustopayourbills.Unfortunatelyinourareahe3be16. 4ofmychildrendependonmesomuchbecauseIamasingleparentbutjustwhenIpaythebillsthatIwillnotbeabletoprovideforthemtheycomeupwithways5helpout.IcompletelyunderstandthatIwillstillhavetofindawaytopaythebillsasIdonotwantmychildrentotakeupanything.Butfornowthefact6theyhavesteppedupandofferedtohelpwithoutanyoneasking7touchme. WhenmydaughterwastwoIrememberrushingtogettoworkgettingtothefrontdoorandaskinghertohurryupandcome.Thensheappearedatthedoor8abagthatshewasholdingopen.IsaidWedon'thavetimeforthis.ShestoppedmeandsaidFillitwithloveMum.Ifelltomykneesandhuggedherandthenkissedher.FromthenonshewouldbringthebagandIwouldbringthelovetothedoorbefore9leaveforschoolandwork.
他不感激他朋友们为他所做的牺牲把这视作是理所当然的.appreciate
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
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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
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
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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