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方程x2﹣x=0的根是( )
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已知方程2x2+4x﹣3=0的两根分别为x1和x2则x1+x2的值等于.
请补充main函数该函数的功能是求方程ax2+bx+c=0的根方程的系数abc从键盘输入例如当a=1
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已知x1x2是一元二次方程x2+2m-1x+3m2-11=0的两个实数根.1m取什么实数时方程有两个
方程x2﹣2x=0的解为
已知函数fx的定义域为R且对任意的实数x导函数f′x满足01若对任意的闭区间[ab]R总存在x0∈
如果方程lg2x+lg2+lg3lgx+lg2·lg3=0的两根为x1x2那么x1·x2的值为
lg2·lg3
lg2+lg3
-6
已知一元二次方程2x2﹣6x﹣1=0的两实数根为x1x2不解方程求代数式的值.
若x1x2是方程2x2-4x+1=0的两个根则的值为
6
4
3
若一元二次方程.x2a+2x+2a=0的两个实数根分别是3b则a+b=________.
理论上X2的取值范围为
-∞<X2<+∞
0≤X2≤+∞
X2≤1
-∞≤X2≤0
X2≥1
请补充main函数该函数的功能是求方程ax2+bx+c=0的两个实数根方程的系数abc从键盘输入如果
同一条输电线三序电抗X1X2X0的大小关系是
X1>X2>X0
X1=X2>X0
X1=X2<X0
X2>1>X0
设椭圆+=1a>0b>0的离心率e=右焦点F.c0方程ax2+bx-c=0的两个根分别为x1x2则点
一元二次方程x2=2x的根是
x=2
x=0
x1=0, x2=2
x1=0, x2=-2
请补充main函数该函数的功能是求方程ax2+bx+c=0的根方程的系数abc从键盘输入例如当a=1
解方程x2+4x−2=0
两圆外切圆心距为5它们的半径分别为R.r若R.r分别是关于x的方程x2﹣mm﹣4x+5﹣m=0的两个
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Prettyinpinkadultwomendonotrememberbeingsoobsessedwiththecolouryetitiswidespreadinouryounggirls'lives.Itisnotthatpinkinherently内在地badbutitissuchatinysliceoftherainbowandthoughitmaycelebrategirlhoodinonewayitalsorepeatedlyandfirmlyblendsgirls'identitytoappearance.Thenitpresentsthatconnectionevenamongtwo﹣year﹣oldsbetweengirlsasnotonlyinnocentbutasevidenceofinnocence.LookingaroundIdespairedattheextremelackofimaginationaboutgirls'livesandinterests. Girls'attractiontopinkmayseemunavoidablesomehowencodedintheirDNAbutaccordingtoJoPaolettianassociateprofessorofAmericanStudiesit'snot.Childrenwerenotcolour﹣codedatalluntiltheearly20thcenturyintheerabeforedomesticwashingmachinesallbabiesworewhiteasapracticalmattersincetheonlywayofgettingclothescleanwastoboilthem.What'smorebothboysandgirlsworewhatwerethoughtofasgender﹣neutraldresses.Whennurserycolourswereintroducedpinkwasactuallyconsideredthemoremasculinecolouradelicateversionofredwhichwasassociatedwithstrength.Bluewithitsintimations暗示oftheVirginMary圣母玛利亚constancyandfaithfulnesssymbolisedfemininity女性化.Itwasnotuntilthemid﹣1980swhenenlargedageandsexdifferencesbecameadominantchildren'smarketingstrategythatpinkfullycameintoitsownwhenitbegantoseeminherentlyattractivetogirlspartofwhatdefinedthemasfemaleatleastforthefirstfewcriticalyears. Ihadnotrealisedhowprofoundlymarketingtrendsinfluencedourperceptionofwhatisnaturaltorelativesincludingourcorebeliefsabouttheirpsychologicaldevelopment.TakingthetoddlerasanexampleIassumedthatphasewassomethingexpertsdevelopedafteryearsofresearchintochildren'sbehaviourwrong.ItturnsoutaccordingtoDanielCookahistorianofchildhoodconsumerismitwaspopularizedasamarketinggimmickbyclothingmanufacturersinthe1930s. Tradepublicationscounseled劝告departmentstoresthatinordertoincreasesalestheyshouldcreateathirdsteppingstonebetweeninfantwearandolderkids'clothes.Itwasonlyaftertoddler学步的小孩becamecommonshoppers'termthatitevolvedintoabroadlyaccepteddevelopmentalstage.Splittingkidsoradultsintoever﹣tiniercategorieshasprovedasafewaytoboostprofits.Andoneoftheeasiestwaystocutupamarketistomagnifygenderdifferences﹣orinventthemwheretheydidnotpreviouslyexist. 1Bysayingitis…therainbowline3Para1theauthormeanspink. A.shouldnotbethesolerepresentationofgirlhood B.shouldnotbeassociatedwithgirls'innocence C.cannotexplaingirls'lackofimagination D.cannotinfluencegirls'livesandinterests 2WhatdoesthewordencodeinPara.2referto? A.discovered B.programmed C.marked D.sealed 3Theauthorsuggeststhatourperceptionofchildren'spsychologicaldevelopmentwasmuchinfluencedby. A.themarketingofproductsforchildren B.theobservationofchildren'snature C.researchesintochildren'sbehavior D.studiesofchildhoodconsumption 4WemaylearnfromParagraph4thatdepartmentstoreswereadvisedto. A.focusoninfantwearandolderkids'clothes B.attachequalimportancetodifferentgenders C.classifyconsumersintosmallergroups D.createsomecommonshoppers'terms 5Itcanbeconcludedthatgirls'attractiontopinkseemstobe. A.clearlyexplainedbytheirinborntendency B.fullyunderstoodbyclothingmanufacturers C.mainlyimposedbyprofit﹣drivenbusinessmen D.wellinterpretedbypsychologicalexperts
函数fx=的定义域为
DidTheEarthMoveForYou? Eleven﹣year﹣oldAngelasufferedfromadiseaseinvolvinghernervoussystem.Shewasunableto1andhermovementwasrestrictedinotherwaysaswell.Thedoctorsdidnotholdoutmuch2ofhereverrecoveringfromthisillness.They3she'dspendtherestofherlifeinawheelchair.Theysaidthat4ifanywereabletocomebacktonormalaftercatchingthisdisease.Butthelittlegirlwasbraveandconfident.Therelyinginherhospitalbedshewould5toanyonewho‟dlistenthatshewasdefinitelygoingtobewalkingagainsomeday. ShewasthensenttoaspecializedrehabilitationhospitalintheSanFranciscoBayarea. Whatevertherapies治疗方法couldbe6tohercasewereused.Thingsdidn'tworkasthetherapistsexpected.Stilltheywerecharmedbyher7spirit.Theytaughtherabout 8﹣aboutseeingherselfwalking.Ifitwoulddonothingelseitwould9giveherhopeandsomething10todointhelongwakinghoursinherbed. Angelawouldworkashardaspossibleinphysicaltherapyinwhirlpoolsandinexercisesessions.Andsheworkedjustashardlyingthere11doingherimagingvisualizingherselfmovingmovingmoving! Onedayasshewastwistingwithallher12toimagineherlegsmovingagainitseemedasthougha13thinghappenedThebedmoved!Itbegantomovearoundtheroom!She14outLookwhatI'mdoing!Look!Look!I15it!Imoved! Ofcourseatthisverymomenteveryoneelseinthehospitalwasscreamingtooandrunningfor16.Peoplewerescreamingequipmentwas17andglasswasbreaking.YouseeitwastherecentSanFranciscoearthquake.Butdon‟ttellthattoAngela. She's18thatshedidit.Andnowonlyafewyearslatershe'sbackinschool. 19herowntwolegs.Nocrutches拐杖nowheelchair.YouseeanyonewhocanshaketheearthbetweenSanFranciscoandOaklandcanconqueralittledisease.Youneverknowwhat‟saroundthecorneruntilyoutakea20step. 1A.hear B.speak C.walk D.see 2A.pride B.hope C.regret D.pity 3A.predicted B.forgot C.denied D.promised 4A.some B.few C.many D.all 5A.apologize B.appeal C.refer D.swear 6A.applied B.appointed C.compared D.explained 7A.competitive B.independent C.sensitive D.undefeatable 8A.concentrating B.summarizing C.picturing D.sorting 9A.inadvance B.forsomereason C.onthecontrary D.atleast 10A.positive B.attractive C.familiar D.boring 11A.gratefully B.faithfully C.hopelessly D.royally 12A.might B.interest C.fame D.need 13A.normal B.magical C.funny D.simple 14A.found B.screamed C.turned D.counted 15A.understood B.refused C.made D.decided 16A.cover B.comfort C.freedom D.office 17A.exploding B.working C.self﹣repairing D.falling 18A.persuaded B.ashamed C.convinced D.worried 19A.By B.With C.On D.For 20A.cautious B.reasonable C.final D.further
欧拉公式eix=cosx+isinxi为虚数单位是由瑞士著名数学家欧拉发明的它将指数函数的定义域扩大到复数建立了三角函数和指数函数的关系它在复变函数论里占有非常重要的地位被誉为“数学中的天桥”根据欧拉公式可知e2i表示的复数在复平面中位于
如图所示宽L=2m足够长的金属导轨MN和M′N′放在倾角为θ=30°的斜面上在N和N′之间连接一个R=2.0Ω的定值电阻在AA′处放置一根与导轨垂直质量m=0.8kg电阻r=2.0Ω的金属杆杆和导轨间的动摩擦因数μ=导轨电阻不计导轨处于磁感应强度B=1.0T方向垂直于导轨平面的匀强磁场中.用轻绳通过定滑轮将电动小车与杆的中点相连滑轮与杆之间的连线平行于斜面开始时小车位于滑轮正下方水平面上的P处小车可视为质点滑轮离小车的高度H=4.0m.启动电动小车使之沿PS方向以v=5.0m/s的速度匀速前进当杆滑到OO′位置时的加速度a=3.2m/s2AA′与OO′之间的距离d=1m求 1该过程中通过电阻R的电量q 2杆通过OO′时的速度大小 3杆在OO′时轻绳的拉力大小 4上述过程中若拉力对杆所做的功为13J求电阻R上的平均电功率.
绝热气缸倒扣在水平地面上缸内装有一电热丝缸内有一光滑的绝热活塞封闭一定质量的理想气体活塞下吊着一重为G的重物活塞重为G0活塞的截面积为S开始时封闭气柱的高为h气体的温度为T1大气压强为p0.现给电热丝缓慢加热若气体吸收热量Q时活塞下降了h求 ①气体的温度升高多少 ②气体的内能增加多少
如图所示顶端装有定滑轮的斜面体放在粗糙水平地面上AB两物体通过细绳连接并处于静止状态不计绳的质量和滑轮轴的摩擦.现用水平向右的力F作用于物体B上将物体B缓慢拉高一定的距离此过程中斜面体与物体A仍然保持静止.在此过程中
执行如图程序框图若输入的x的值为1则输出的n的值为.
在同一匀强磁场中α粒子He和质子H做匀速圆周运动若它们的动量大小相等则α粒子和质子
在各项均为正数的数列{an}中a1=a且an+1=. 1当a3=2时求a的值 2求证当n≥2时an+1≤an
下列函数是奇函数的是
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