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反比例函数y＝的图象如图所示则一次函数y＝kx+bk≠0的图象大致是
如图1点A08点B2a在直线y＝﹣2x+b上反比例函数y＝x＞0的图象经过点B． 1求a和k的值 2将线段AB向右平移m个单位长度m＞0得到对应线段CD连接ACBD． ①如图2当m＝3时过D作DF⊥x轴于点F交反比例函数图象于点E求的值 ②在线段AB运动过程中连接BC若△BCD是以BC为腰的等腰三形求所有满足条件的m的值．
AfewmonthsagoIwaspickingupthechildrenatschool.EmilyanothermotherthatIknewwellrusheduptome.Shewasfilledwithanger.DoyouknowwhatyouandIare?shedemanded.BeforeIcouldanswershegaveoutthereasonforherquestion.Shehadjustreturnedfromrenewingherdriver'slicenseatagovernmentoffice.AskedbythewomanrecordertostateheroccupationEmilyhesitateduncertainhowtoclassifyherself.WhatImeanisexplainedthewomandoyouhaveajoborareyoujusta…?OfcourseIhaveajobansweredEmily.I'mamother.Wedon'tlist‘mother'asanoccupation…‘housewife'coversitsaidtherecorderemphatically强调地. IforgotallaboutherstoryuntilonedayIfoundmyselfinthesamesituation.ThistimeitwasatourownTownHall.Theclerkwasawoman.Andwhatisyouroccupation?sheasked.WhatmademesayitIdonotknow.Thewordssimplyjumpedout.I'm…aResearchAssociateinthefieldofChildDevelopmentandHumanRelations.Theclerkpausedherball﹣pointpenfrozeninmidairandlookedupasthoughshehadnotheardright.Irepeatedthetitleslowly. MightIasksaidtheclerkwithnewinterestjustwhatyoudoinyourfield?CoollyIheardmyselfreplyIhaveacontinuingprogramofresearchinthelaboratoryandinthefield.I'mworkingformymastersthewholefamilyandalreadyhavefourcreditsalldaughters.Ioftenwork14hoursaday24ismorelikeit.Butthejobismorechallengingthanmostjobsandtherewardsareinsatisfactionratherthanjustmoney. Therewasanincreasingnoteofrespectintheclerk'svoiceasshecompletedtheformstoodupandpersonallyshowedmeout.AsIdroveintoourdrivewayIwasgreetedbymylabassistants﹣﹣﹣ages137and3.AndupstairsIcouldhearournewexperimentalmodelsixmonthsinthechild﹣developmentprogram.Ifeltsuccessful. Motherhood…whatagloriouscareerespeciallywhenthereisatitleonthedoor. 1Onhearingtheauthor'sansweratthetownhalltheclerkfelt. A.boredanddisappointed B.surprisedandcurious C.satisfiedandexcited D.interestedandrespectful 2Whatdoyouknowabouttheauthor'sfamily? A.Herdaughtersareallinvolvedinachild﹣developmentprogram. B.HerfamilyissupportedbyherworkasaResearchAssociate. C.Shehasfourdaughtersandtheyoungestissixmonthsold. D.Thereareatmostfivemembersinherfamily. 3Whatdoestheauthorthinkofherownjob? A.Excitingandprofitable. B.Satisfyingandsuccessful. C.Hardanddisappointing. D.Dullandmeaningless. 4Thetoneinwhichtheauthorwritesthetextis. A.indifferent B.cautious C.objective D.humorous
WarleyWoodsCommunity社区Trust Welcometoourthirdnewsletteroftheyear! •OurmainactivityforMarchisourWalkfortheWoodsfundraisingeventsonSaturday17thMarchstartinganytimebetween10a.m.and2p.m.WewillbewalkingthedistancebetweenWarleyWoodsandTipperary.Itisindeedalongway﹣﹣﹣80miles.Themorepeoplethatyoucangetsponsoryouthemoremoneywecanraisetohelplookafterourbeautifulwoodland.Moreinformationisavailableatourwebsite. •TheSundayvolunteersplantedtwobeeches山毛榉andanoak橡树lastweek.ThiswasthankstothemoneyfromtheBigTreePlantandtoLisaandGordonWhitikerwhosefriendsgavemoneyforthebigtreesinsteadoffortheirweddingpresents.Thankstoeveryonewhotookpart. •Therewere15volunteersattheOralHistoryTrainingDaywhichwasledbyJuliaLetts.Thegroupwillbemeetingagainandwillstarttointerviewthelocalpeoplewhohaveofferedtotelltheirstories.WearehappytohearfromotherswhowouldliketobeinterviewedabouttheirmemoriesoftheWoodsfortheproject.IfyouoranyoneyouknowisinterestedpleasecallVivColeattheoffice.ThisprojectisfinancedbyHeritageLotteryFund. •TherewasahugeresponsetotheForestSchoolsactivitiesheldathalfterm.ThesewillbeheldagainduringtheEasterholidaysonthefollowingdates:4thAprilfrom10a.m.to3p.m.forover8s.On12thAprilfrom10a.m.to12noontherewillbeaTeddyBears'Picnicfortheunder8s.Allthesemustbebookedinadvance. •Finallydon'tforgettheEasterEggRollonBankHoliday9thAprilstartingat11a.m.Bringyourownhard﹣boiledanddecoratedeggtorolldownthehillinthewoods.Thefirstpastthefinishinglinewillwinalargechocolateegg!ThisyearduetopopulardemandtherewillalsobeanAdults'EasterEggRollfollowingthechildren'scompetition. •Welookforwardtoseeingyouallsoonatoneofourmanyevents. 1Whichofthefollowingwillbeon9thApril? A.WalkfortheWoods B.TeddyBears'Picnic C.TheEasterEggRoll D.TheOralHistoryTrainingDay 2HeritageLotteryFundprovidesmoneyto. A.helplookafterthewoodland B.collectstoriesaboutthecommunity C.holdactivitiesfortheForestSchools D.organizetheEasterholidaycompetition 3Thepassageiswrittento. A.informpeopleofthecomingevents B.encouragepeopletoworkasvolunteers C.invitepeopletotakepartinthecompetition D.tellpeopleaboutsomefamousorganizations 4Thepassageisprobablytakenfrom. A.anadvertisement B.amagazine C.acommunitybrochure D.anofficialreport
分解因式m2﹣4m+4＝．
Dashisasymbolwhichrepresentseverydaywe'vespentaliveonearth.Thereforehowyouspendyourdashisimportant. RecentlyI1aboutalittlegirlnamedHope.AfterlearningmoreaboutherlifeIcouldn'thelpbutfeelitwasnotbycoincidencenorhappenstance偶然事件2shehadbeennamedHope.Thestrongfeelingofsympathyandgenerosity3inheryoungheartmadealastingimpressiononmeandcountlessothers.4IneverhadtheopportunitytomeetherIwishIhad. Hopewasatwelve﹣year﹣oldgirlwhowas5awishinearlyDecember2010bytheMake﹣A﹣WishFoundationafterbeing6thatshehadararetypeofbonecancer.Howeverwhenshefoundoutthatmorethan1507inherareawerewaitingfortheirwishestobegranted实现sheunselfishlyusedherwishto8thatthosechildrenhavetheirwishesgranted.Shealsoaskedthatitbedone9January162011.Unfortunatelyhowevertheorganizationinformedherthather10requestcouldnotbegrantedasthefunds资金weresimply11.Theycalculatedthattheywouldneedtoraisemorethanone12dollarsinthirtydaysinordertograntherwish.13butnotdiscouragedsheturnedherdisappointmentintoanenthusiasmthatinspiredcaringindividualstotake14helpinggrantthewishesoftheotherchildrenandeventually15aswell.NewspapercolumnistsandreportersforradioandTVstations16thestoryofthiscaringyounggirlwhohad17theheartsofsomanyandaswordspreadthecommunitywaschallenged.Committeeswereformedandschoolscorporationsandvariousorganizationsassistedin18moneytohelpmakeHope'sdreamcometrue. Hereffortswerenotinvainastheycontinuetohelpothersnotonly19butspirituallyandemotionallyaswell.AtthegatheringtocelebrateherlifeACelebrationofHopeonJanuary162011the20wasmadethattheyhadindeedreceiveddonationstotalingmorethanonemilliondollars.Herwishhadbeengranted! 1A.heard B.thought C.cared D.talked 2A.which B.that C.how D.why 3A.lost B.lived C.expected D.housed 4A.Until B.Unless C.Though D.If 5A.expressed B.offered C.made D.sent 6A.recognized B.informed C.reminded D.diagnosed 7A.children B.citizens C.villagers D.relatives 8A.command B.ask C.arrange D.order 9A.for B.to C.on D.by 10A.final B.formal C.simple D.noble 11A.unbearable B.unbelievable C.unavailable D.uncomfortable 12A.thousand B.hundred C.million D.billion 13A.Disappointed B.Surprised C.Worried D.Embarrassed 14A.down B.up C.in D.over 15A.theirs B.ours C.hers D.yours 16A.heard B.read C.believed D.shared 17A.touched B.examined C.lost D.opened 18A.finding B.spending C.raising D.borrowing 19A.mentally B.physically C.healthily D.financially 20A.proposal B.decision C.conclusion D.announcement
如图等边△ABC的边长为4点O是△ABC的外心∠FOG＝120°．绕点O旋转∠FOG分别交线段ABCD于DE两点．连接DE给出下列四个结论①OD＝OE②S△ODE＝S△BDE③S四边形ODBE＝④△BDE周长的最小值为4．上述结论中正确的个数是
函数y＝﹣ax+a与y＝a≠0在同一坐标系中的图象可能是
某市为提倡居民节约用水自今年1月1日起调整居民用水价格．图中l1l2分别表示去年今年水费y元与用水量xm3之间的关系．小雨家去年用水量为150m3若今年用水量与去年相同水费将比去年多元．
化简+的结果是
美国太空探索公司SpaceX试射的猎鹰重型运载火箭把一辆电动汽车送入绕太阳飞行的轨道下列关于该电动汽车说法正确的是
假定英语课上老师要求同桌之间交换修改作文请你修改你同桌写的以下作文.文中共有10处语言错误每句中最多有两处.错误仅涉及一个单词的增加删除或修改. 增加:在缺词处加一个漏字符号^并在其下面写出该加的词. 删除:把多余的词用\划掉. 修改:在错的词下画一横线并在该词下面写出修改后的词. 注意:1.每处错误及其修改均仅限一词; 2.只允许修改10处多者从第11处起不计分. TheotherdayasIwalkedtoschoolIpassedsmallconstructionarea.Itwasnotfarawayinmyschool.Inoticeamanbringingabunchofthings:shoesblanketssomecannedfoodandclothing.Perhapstheitemsweregatheredfromhisfamilyandsomeofhisfriend.Hestartedlayingitdownforpeopletotake.CertainlyIwascuriousaboutwhatthingswouldbegoing.ButIrushedthereafterschool.Isawthatmuchoftheitemsweretakenbyothers.Ihavereadlotsofinspiredstoriesofkindness.ThisisprobablythesweetestactofkindnessI'vebeenwitnessedsofar.
AB两地相距18千米甲工程队要在AB两地间铺设一条送天然气管道乙工程队要在AB两地间铺设一条输油管道．已知乙工程队的工作效率是甲队的1.5倍甲队提前3周开工结果两队同时完成任务求甲乙两队每周各铺设多少千米管道
1已知正方形ABCD中对角线AC与BD相交于点O如图①将△BOC绕点O逆时针方向旋转得到△B′OC′OC′与CD交于点MOB′与BC交于点N请猜想线段CM与BN的数量关系并证明你的猜想． 2如图②‚将1中的△BOC绕点B逆时针旋转得到△BO′C′连接AO′DC′请猜想线段AO′与DC′的数量关系并证明你的猜想． 3如图③ƒ已知矩形ABCD和Rt△AEF有公共点A且∠AEF＝90°∠EAF＝∠DAC＝α连接DECF请求出的值用α的三角函数表示．
某中学欲开设A实心球B立定跳远C跑步D足球四种体育活动为了了解学生们对这些项目的选择意向随机抽取了部分学生并将调查结果绘制成图1图2请结合图中的信解答下列问题 1本次共调查了名学生 2将条形统计图圉补充完整 3求扇形C的圆心角的度数 4随机抽取了3名喜欢“跑步”的学生其中有1名男生2名女生现从这3名学生中选取2名请用画辩状图或列表的方法求出刚好抽到一名男生一名女生的概率．
实数ab在数轴上的对应点的位置如图所示下列关系式不成立的是
下列计算正确的是
如图1抛物线Cy＝ax2+bx经过点A﹣40B﹣13两点G是其顶点将抛物线C绕点O旋转180°得到新的抛物线C′． 1求抛物线C的函数解析式及顶点G的坐标 2如图2直线ly＝kx﹣经过点AD是抛物线C上的一点设D点的横坐标为mm＜﹣2连接DO并延长交抛物线C′于点E交直线l于点M若DE＝2EM求m的值 3如图3在2的条件下连接AGAB在直线DE下方的抛物线C上是否存在点P使得∠DEP＝∠GAB若存在求出点P的横坐标若不存在请说明理由．
﹣7的相反数是
已知一组数据628x7它们的平均数是6则这组数据的中位数是．
菱形ABCD中∠A＝60°其周长为24cm则菱形的面积为cm2．
在平面直角坐标系中如果点P的坐标为mn则向量可用点P的坐标表示为＝mn．已知＝x1y1＝x2y2若x1x2+y1y2＝0则与互相垂直．下面四组向量 ①＝3一9＝1一 ②＝2π0＝2﹣1﹣1 ③＝cos30°tan45°＝sin30°tan45° ④＝+2＝﹣2．其中互相垂直的组有．
某数学社团开展实践性研究在大明湖南门A测得历下亭C在北偏东37°方向继续向北走105m后到达游船码头B测得历下亭C在游船码头B的北编东53°方向．请计算一下南门A与历下亭C之间的距离约为参考数据tan37°≈tan53°≈
如图ABCD是⊙O的两条直径过点C的⊙O的切线交AB的延长线于点E连接ACBD． 1求证∠ABD＝∠CAB 2若B是OE的中点AC＝12求⊙O的半径．
2019年1月3日“嫦娥四号”探测器成功着陆在月球背面东经177.6度南纬45.5度附近实现了人类首次在月球背面软着陆．数字177.6用科学记数法表示为
一个n边形的内角和等于720°则n＝．
如图在▱ABCD中EF分别是AD和BC上的点∠DAF＝∠BCE．求证BF＝DE．
解不等式组并写出它的最小整数解．
已知抛物线y＝ax2+bx+ca≠0的对称轴为直线x＝2与x轴的另一个交点坐标为40其部分图象如图所示下列结论①抛物线过原点②4a+2b+c＝0③a﹣b+c＜0④抛物线的顶点坐标为2b⑤当x＜2时y随x增大而减小．其中结论正确的是
计算﹣1+π+10﹣2cos60°+
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