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如图,抛物线y=a(x+3)(x-k)交x轴于点A、B,(A左B右),交y轴于点C,△AOC的周长为12,sin∠CBA=,则下列结论:①A点坐标(-3,0);②a=-;③点B坐标(8,0);④对称...
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如图在平面直角坐标系中已知抛物线y=ax2+bx+c交x轴于A.20B.60两点交y轴于点.1求此抛
如图抛物线y=﹣x2+bx+c交x轴于点A.﹣30和点B.交y轴于点C.03.1求抛物线的函数表达式
已知抛物线经过点A.-10B.30C.0-3.Ⅰ求抛物线的解析式及其顶点D.的坐标;Ⅱ直线CD交x轴
如图抛物线y=﹣x2+bx+c交x轴于点A.﹣30和点B.交y轴于点C.03.1求抛物线的函数表达式
如图已知抛物线y=ax2+bx+3交x轴于AB两点A在B左边交y轴于C点且OC=3OA对称轴x=1交
如图抛物线y=ax-12+4与x轴交于点A.B.与y轴交于点C.过点C.作CD∥x轴交抛物线的对称轴
如图抛物线1=x2+bx+c与x轴交于点A.B.交y轴于点C.0﹣2且抛物线对称轴x=﹣2交x轴于点
如图在平面直角坐标系中抛物线y=x2+mx交x轴的负半轴于点A.点B.是y轴正半轴上一点点A.关于点
如图抛物线y=﹣x2+bx+c交x轴于点A.﹣30和点B.交y轴于点C.03.1求抛物线的函数表达式
如图抛物线y=ax2+bx+ca≠0与x轴交于A.﹣10B.40两点与y轴交于点C.02点M.mn是
如图已知抛物线y=ax2+bx+3交x轴于AB两点A在B左边交y轴于C点且OC=3OA对称轴x=1交
如图抛物线y=ax+2²+3a<0与y轴正半轴交于点A过点A作AB∥x轴交抛物线于点B抛物线的对称轴
已知抛物线C.y=x2﹣4x.1求抛物线C.的开口方向对称轴和顶点坐标2将抛物线C.向下平移得抛物线
如图1点A.为抛物线C.1y=x2-2的顶点点B.的坐标为10直线AB交抛物线C.1于另一点C.1求
如图已知抛物线经过点A.﹣20B.40C.0﹣8.1求抛物线的解析式及其顶点D.的坐标2直线CD交x
已知抛物线y=x2﹣2x+c与x轴交于A.B两点与y轴交于C点抛物线的顶点为D点点A的坐标为﹣10.
已知抛物线与x轴交于A.-10B.两点点B.在x轴的正半轴上与y轴交于点C.0-3抛物线顶点为M.连
在平面直角坐标系中点0为坐标原点抛物线y=-x-2x-kk>2与x轴交于点A.B.点A.在点B.的左
已知抛物线y=x2﹣k+2x+和直线y=k+1x+k+12.1求证无论k取何实数值抛物线总与x轴有两
如图1点A.为抛物线C.1的顶点点B.的坐标为10直线AB交抛物线C.1于另一点C.1求点C.的坐标
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在“探究加速度与力质量的关系”的实验中 1对于本实验以下说法中正确的是 A.砂和桶的总质量要远大于小车的总质量 B.每次改变小车质量后需要重新平衡摩擦力 C.实验中也可不测加速度的具体数值只要测出不同情况下加速度的比值就行了 D.若要验证“加速度与力的平方成正比”这一猜想在作图线时最好以F2为横坐标 2某同学在接通电源进行实验之前将实验器材组装如图1所示下列对此同学操作的判断正确的是 A.打点计时器不应固定在长木板的最右端而应固定在靠近定滑轮的那端 B.打点计时器不应使用干电池而应使用交流电源 C.不应将长木板水平放置而应在右端垫起合适的高度平衡摩擦力 D.小车初始位置不应离打点计时器太远而应靠近打点计时器放置 3改正实验装置后该同学顺利地完成了实验.在实验中保持拉力不变得到了小车加速度随质量变化的一组数据如下表所示 请你在图2方格纸中建立合适坐标并画出能直观反映出加速度与质量关系的图线. 4从图线可得出拉力大小为结果保留两位有效数字. 5保持小车质量不变改变砂和砂桶质量某同学根据实验数据作出了加速度a随合力F的变化图线如图3所示.此图中直线发生明显弯曲的原因是.
求下列各式字母的取值范围.
TheMetropolitanMuseumofArtMetisoneoftheworld'slargestandfinestartmuseums.Followingthesuggestedroutewillhelpyouexplorethemuseum.TheTempleofDendurThis2000﹣year﹣oldbuildingstoodneartheNileRiversurroundedbyawallthatnolongerexists.Butyoucanstillpeekthroughthegateway.Whose'house'isthis?It'snotforpeople.It'sforgods.Canyouidentifythem?Theyfaceout.Akingfacesinbringingofferings.MetSpeaksBringingtogethersomeofthemostrespectedthinkersonagivensubjectMetSpeaksfeatureslecturesdiscussionstalksfilmsandforumsinwhichcompellingvoicesexploretimelyissuesthatconnecttotheMet'sexhibitionsandpermanentcollection.Programtimesaudiencesandtopicsvary.TimetoSketchSettledownforafewminutespicksomethinginthisgalleryandhavefundrawingit.Enjoythechancetolookcarefullyasyoucreateyourownsketch.You'llbesurprisedathowmuchmoreyounoticethankstoexploringartbysketching.MetAccessMaketheMetyours!Choosefromavarietyofservicesandexcitingprogramsthataretailoredtomeettheneedsofvisitorswithdisabilities.Programtimesaudiencesandtopicsvary.AskfortheAccessInformationbrochureandAccessCalendaratInformationDesksdownloadtheAccessCalendarPDForcall212﹣650﹣2010oremailaccess@metmuseum.org.AdmissionFeeincludesadmissiontotheMainBuildingandsame﹣weekadmissiontotheCloistersmuseumandgardens.1Howmuchisrecommendedtopayfor3adultand2studentvisitors?A.﹩99B.﹩111C.﹩87D.﹩1032WhatcanyouknowabouttheTempleofDendur?A.Ahighwallissurroundingthe2000﹣year﹣oldbuildingnow.B.Akingfacesoutbringingofferingsinthetemple.C.ThebuildingisdesignedforEmperortolivein.D.TheNileRiverwitnessedthehistoryofthebuilding.3WhichofthefollowingisTRUEabouttheMet?A.IssuesconnectedwitheconomiccrisiswillbediscussedinMetSpeaks.B.Visitorscanchoosesomethinginthegalleryandhavefundrawingitonthewall.C.Disabledpeoplewillfindvariousservicesandprogramsofferedespeciallyforthem.D.Youcanemailaccess@metmuseum.orgformoreAdmissioninformation.
一质点在某段时间内做曲线运动则在这段时间内
如图所示沿水平方向做匀变速直线运动的车厢中悬挂小球的悬线偏离竖直方向37°角小球和车厢相对静止球的质量为1kg.g取10m/s2sin37°=0.6cos37°=0.8 1求车厢运动的加速度并说明车厢的运动情况. 2求悬线对球的拉力.
ThereisawonderfulstoryaboutJimmyDuranteoneofgreatsingers.1asktobeapartofashowforsomeoldWorldWarⅡsoldiershetoldthemhewasverybusyandhecouldaffordonlyafewminutes2hewouldcomeiftheywouldn'tmindhissingingoneshortsongandimmediatelyleavingforhisnextappointment.Ofcoursetheshow'sdirectoragreed3happy.ButwhenJimmygotonstagesomethingsurprisinghappened.Hewentthrough4shortsongandthenstayed.Theapplausegrewlouderandlouderandhekept5stay.Prettysoonhehadbeenonstage6fifteentwentyandthenthirtyminutes.Oneofhis7assistbehindthestagestoppedhimandsaid'Ithoughtyouhadtogoafterafewminutes.Whathappened?'Jimmyanswered'IdidhavetogobutIcanshowyouthereasonwhyIstayed.Youcanseefor8youifyoulookatthefrontrow.'Inthefrontrowweretwomenbothof9hadlostanarminthewar.Onehadlosthisrightarmandtheotherhadlosthisleft.Togethertheywereabletoclapandthatwasexactlywhatthey10doloudlyandcheerfully.
常用的电磁打点计时器和电火花计时器使用的是填“直流电”“交流电”正常工作时每隔s打一个点.
某校有高一学生n名其中男生数与女生数之比为65为了解学生的视力情况现要求按分层抽样的方法抽取一个样本容量为的样本若样本中男生比女生多12人则n=
某几何体的三视图如图所示则该几何体的体积为
等比数列{an}的前n项和为Sn若S10=10S30=30则S20=
如图所示水平桌面上叠放着AB两物体均与桌面相对静止不动则B物体受力个数为
一辆汽车沿笔直的公路行驶第1s内通过5m的距离第2s内和第3s内各通过20m的距离第4s内又通过15m的距离求汽车在最初2s内的平均速度和这4s内的平均速度各是多少
下列说法中哪些表示的是时刻
已知集合A={x∈N|x<3}B={x|x2﹣x≤0}则A∩B=
求下列各式字母的取值范围.
四棱锥P﹣ABCD的每个顶点都在球O的球面上PA与矩形ABCD所在平面垂直AB=3AD=球O的表面积为13π则线段PA的长为.
判断无理数都是开方开不尽的数.判断题
如图所示为AB两运动物体的位移图象.下述说法中正确的是
Whenwegiveourkidsholidaygiftsmanyofuscan'twaittoheartheirappreciativecriesof'thankyou!'oncethewrappinggetsrippedoff.Buthere'satip:You'dbewisenottoexpectmuchgratitudefromthemforwhattheyreceive.Gratitudecanmakeushappierhealthierandevenfitter.Butdothekidsshowtheirgratitudeforthestuffwebuythem?AlltheresearchI'vedonehasconvincedmethatitwon'thappen.Onemomtoldmethatwhensheaskedher16﹣year﹣oldsontothankherforbuyinghimacellphonehesaid'Butthat'swhatmomsshoulddo.'Fromateenager'sangleit'saparent'sresponsibilitytotakecareofthefamily.AccordingtoDunhamYale'sassistantprofessorofpsychology'Whenteenagerscodeitthatwayagiftisnolongersomethinggivenfreelyandvoluntarily'﹣it'sjustmomanddadlivinguptotheirobligation.Parentsdohavetherighttodemandgoodmannersandchildrenshouldthanksincerelywhoevergivesthemsomething.Butkidscan'tknowhowblessedtheyareunlesstheyhaveabasisforcomparison.Andtheydon'tlearnthatbyaparentcomplainingthatthey'reungrateful.Weneedtogiveourchildrenthegiftofawiderworldview.Showbyexamplethatgratitudeisn'taboutstuff﹣whichultimatelycan'tmakeanyofushappyanyway.It'saboutrealizinghowluckyyouareandpayingyourgoodfortuneforward.Youcancollectallthecharitableappealsandsitdowntogetherwiththekidstogothroughthem.Yousetthebudgetforgivingandthekidsdecidehowit'sdistributed.Oncetheconversationaboutgratitudegetsstartedit'smucheasiertocontinueallyear.Alsoyoucansetupafamilyroutineatbedtimewherekidsdescribethreethingsthathavemadethemgrateful.Whenkidsgoofftocollegeyoucantextthemapictureeachweekofsomethingthatinspiresyourappreciation.Teachingchildrentofocusonthepositiveandappreciatethegoodintheirlivesisperhapsthegreatestgiftwecangivethem.Andwecanalllearntogetherthatthethingsthatreallymatteraren'tonsaleatadepartmentstore.1Howdochildrenrespondwhenreceivinggiftsfromtheirparents?A.Theyshownointerestintheirparents'gifts.B.Theycan'twaittoopentheirparents'gifts.C.Theyshowmuchgratitudetotheirparentsforthegifts.D.Theytaketheirparents'giftsforgranted.2Tomakechildrengratefulforwhattheyhaveparentsshould.A.liveuptotheirobligationB.asktheirchildrentohavegoodmannersC.teachtheirchildrenbysettinganexampleD.complaintheirchildrenareungrateful3Whatcanwelearnfromthelasttwoparagraphs?A.Nogiftsaregreaterthanteachingchildrentobepositiveandgrateful.B.Childrenoughttorealizehowluckytheyaretohaveconsiderateparents.C.ChildrenaresupposedtodecidehowtodistributetheirownmoneyD.Itiseasyforparentstostarttheconversationaboutgratitude.4What'sthepurposeoftheauthorwritingthistext?A.Toexplainthereasonwhychildrenoffernogratitudetotheirparents.B.Togiveadvicetoparentsonhowtohelpchildrendevelopgratitude.C.Toencourageparentstodothingstogetherwiththeirchildren.D.Toremindparentsoftheirresponsibilitytoeducatetheirchildren.
设xy满足约束条件则z=x+y的最大值与最小值的比值为
有关滑动摩擦力的下列说法中正确的是
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一质量为5kg的滑块在F=15N的水平拉力作用下由静止开始做匀加速直线运动若滑块与水平面间的动摩擦因数是0.2g取10m/s2问 1滑块运动的加速度是多大 2滑块在力F作用下经5s通过的位移是多大 3如果力F作用8s后撤去则滑块在撤去F后还能滑行多远
判断有理数都是有限小数.判断题
若实轴长为2的双曲线Ca>0b>0上恰有4个不同的点Pii=1234满足|PiB|=2|PiA|其中A﹣10B10则双曲线C的虚轴长的取值范围为
已知tanα+β=1tanα﹣β=5则tan2β=.
求下列各式的值.
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假定你是李华你所在的学校将要举办一场春节庆祝活动.你和你的同学邀请在你校的美国交换生Tom参加.请你写一封信给Tom要点如下:1.活动内容;2.邀请Tom一起表演一个中西合璧的节目;3.活动时间:2015年农历12月30日晚7:00﹣10:004.活动地点:学校学术报告厅.注意:1.词数100左右;2.可以适当增加细节以使行文连贯;3.开头语已经为你写好.DearTomYouhavetoldmethatyouareveryinterestedinhowweChinesecelebrateourtraditionalfestivals..Wearelookingforwardtoyourreply.YourssincerelyLiHua.
一个物体做自由落体运动如图所示的四幅图中表示其v﹣t图象正确的是
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