填空题设z=x3y+2xy2-x，则

填空题已知A是3阶非零矩阵，若矩阵使得AB=0，又知A+3E不可逆，则秩r(A)+r(A+E)=______．

填空题设f(u)连续，且du(x，y)=f(xy)(ydx+xdy)，则u(x,y)=______．

填空题设f(3x+1)=，则∫01f(x)dx=________．

填空题设，且f(0)=0，则f(x)=________。

填空题设F(x)为lnx2的原函数，则=________。

填空题设随机变量X服从参数为λ的指数分布，且E[(X-1)(X+2)]=8，则λ=______．

填空题曲线9y 2 =4x 3 上从x=0到x=1的一段弧的长度为_______

填空题 若f'(ex)=1+e2x，且f(0)=1，则f(x)=______．

填空题D是圆周x2+y2=Rx所围成的闭区域，则=________。

填空题方程组x 1 +x 2 +x 3 +x 4 +x 5 =0的基础解系是_________．

填空题设 L 为连接点(-1,0)，(0,1) 的直线段，对弧长的曲线积分

填空题二重积分________.

填空题[A]Evenastherobotsdotheirwork(officialsshouldknowwithinadaywhethertherobotsweresuccessful),BPispreparingtodrillareliefwellintowhichtheoriginalwellwouldempty.Thatcouldallowthecompanytoinjectaheavyfluidintothebrokenwellthatwouldslowandeventuallystoptheflowofoil.Oncetheleakisstanched,BPcouldpermanentlysealthefirstwell.[B]TheexplosionontheDeepwaterHorizonoilriglastweekintheGulfofMexicowaswithoutquestionahumantragedy.ThedayaftertherigfinallysankonApril22,theCoastGuardcalledoffthesearchforthe11workerslostduringtheaccident.[C]ButtheGulf's$2.4billionfishingindustrycouldbeimperiledbyamajorspill,ascouldtourismupanddowntheGulfCoastandpotentiallytheFloridapanhandle(狭长地带)."Wearebeingvery,veryaggressive,"saidTonyHayward,theCEOofBP,whichexpectstospendsome$100milliononthecleanup."Thisisthebiggestresponsebyanyoneintheindustryever,andwe'reabletodoitbecauseweplannedforit.Wewillbejudgedbyourresponse."[D]Nowtheaccidentthreatenstobecomeanenvironmentaltragedyaswell.Despiteearlyhopesthattheoilspillcouldbeminimized,therig'sfractureddrillingpipeiscurrentlyleaking42,000gal.ofcrudeaday.Theresultisanoilslickonthesurfaceofthewater,coveringmorethan1,800sq.miles,nowjust20milesfromthedelicateGulfcoastline.Dependingonwindconditions,oilcouldbeginwashingupontheshoreasearlyasthisweekend.[E]TheCoastGuardandtheenergygiantBP,whichoperatedthesunkenrigandisresponsibleforthecleanup,havelaunchedamassiveoperationtocontainthespill—anunusualchallenge,consideringthecomplexityofunderwaterdrilling.First,remote-controlledrobotsubmarineshavebeendeployedtotrytosealofftheoilwellaltogetherbyactivatingamassivedevicecalledablowoutpreventer.Ifthe450-tonvalveatthewellheadcanbeturnedon,theoilflowshouldstop,andthespillcouldbeendedquickly.Buttheoutcomeisfarfromguaranteed;robotshaveneverbeenusedinanoperationofthismagnitudenoratthisdepth—some5,000ft.belowthesurfaceoftheocean.[F]Cleanuphasalreadybeenunderway.Vesselsaredragginglongbooms(拦油栅)tocorraltheoilonthesurface—whichisstillathinslick,notyetathicktar—whitetheplanesspraychemicaldispersantsthatcanseparatethecrudefromthewater.CoastGuardofficialssaidtheywouldconsideracontrolledburnoftheoil.Poolsofoilwouldbetrappedincontainmentboomsandsetonfire.Theburningoilwouldalsocreateaplumeofsmokeandairpollution,whichcouldaffectflyingbirds.ButaccordingtotheNationalOceanicandAtmosphericAdministration,marinewildlifewouldbelessharmedbyaburningareaoftheoceanthanbyexposuretoanoilslick.[G]Buttheentireoperationwouldlikelytakemonths,duringwhichtimetheoilwouldkeepspilling.SoBPisalsopreparingtobuildamassivedomethatcouldbeplacedovertheoilleaks—whichareemanatingfromapipethatconnectsthewelltothesunkenrig—andactuallycollecttheleakingcrude.Theonlyproblemisthatsuchanenterprisehasneverbeenattemptedindeepwater,anditwouldtakeatleasttwoweekstobeputinplace.

填空题在y轴上的0≤y≤2一段上，有一根细棒，其上每一点处的线密度等于该点到棒两端的距离平方之积，则其质心

填空题设f(x，y，z)=e x yz 2 ，其中z=z(x，y)是由x+y+z+xyz=0确定的隐函数，则f x ’(0，1，一1)=_________．

填空题曲线的渐近线方程为________．

填空题P=88． (1)某学生语文、数学、英语的平均成绩为93分，语文、数学的平均成绩为90分，语文、英语的平均成绩为93.5分．该生语文成绩为P； (2)10个连续偶数的合是从1开始的10个连续奇数和的2.5倍，其中最大的偶数为P．

填空题若，则幂级数的收敛半径是________．

填空题设f(2)=1，，则________.