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设关于x的方程x²+a-3x+3a=0有两个不相等的实数根x1x2且x1＜2＜x2那么a的取值范围是
2分只要Lily坚持写日记她就会取得进步的. AslongasLilykeepingdiariesshe'llmakeprogress.
如图所示AB两物体从同一点开始运动从AB两物体的位移图象可知下述说法中正确的是A．AB两物体同时自同一位置向同一方向运动B．AB两物体自同一位置向同一方向运动B比A晚出发2sC．AB两物体速度大小均为10m/sD．AB两物体在A出发后4s时距原点20m处相遇
已知x1和x2是方程x²-3x=1的两个根求1x12+x22 2 3x1+1x2+1 4x1-x2
若方程x²-6x+m=0的两个根为x1x2且3x1+2x2=20则m=
2015年·固原一中三模以下说法中正确的是
求作一个一元二次方程使它的两根分别为-32．
说出下列方程的两根和与两根积各是多少x²+3x-1=0
在一大雾天一辆小汽车以30m/s的速度行驶在高速公路上突然发现正前方30m处有一辆大卡车以10m/s的速度同方向匀速行驶小汽车紧急刹车刹车过程中刹车失灵．如图ab分别为小汽车和大卡车的v-t图线以下说法正确的是
2分Theworkersbuildalotofbuildingseveryyear.变为被动语态 Alotofbuildingsbytheworkerseveryyear.
2分Heboughtthebooktwoyearsago.改为同义句 Hethebookfortwoyears.
2分努力学习你的梦想一定会实现.完成译句 Studyhardandyourdreamwill.
关于x的一元二次方程x2+3x+m-1=0的两个实数根分别为x1x2若2x1+x2+x1x2+10=0求m的值．
若关于x的一元二次方程k-1x2+2x-2=0有不相等实数根则k的取值范围是．
10分OnacoldwinterafternoonIwaswalkinghomefromasupermarket.IwasfeelingalittletiredasIwascarryingmybagsfulloffoodandotherthings.TheyweresoheavythatIdecidedtostoptohavearestinthepark.Iwalkedtowardsthegateofthepark.Inoticedapoormanwalkingoutoftherestaurantinfrontofme.Hewasholdingapaperbag.Hewalkedtoanearbydustbin垃圾箱andstartedlookingthroughit. Isuddenlyfeltsad.IknewthismanwouldtakeallthathecouldgetsoIwentuptohimandgavehimsomefruit.Themanwithwrinkles皱纹onhisfacelookedupinsurpriseandtookwhatIgavehim. AbigsmileappearedonhisfaceandIfeltveryhappy.ThenhesaidWow!Firstsomeonegavemethissandwichthenthisdrinkandnowsomedeliciousfruit.Thisismydaughter'sluckyday.Thankyouboy.Thenhewentawaysingingasong. JustthenIunderstoodwhatthesayingGivingisgettingreallymeant.Everyoneintheworldneedshelpeveryonecanofferhelpandeveryonewillbehelpedbyshowingkindness. Givingsometimesdoesn'tcostmuchbutitmeansalottothepeoplewhoyouhelp.Theman'shappinessatthatmomentcomesintomymindeverytimeIhavethechancetohelpothers. 1.Thewriterfeltalittletiredbecause. A.heworkedsohard B.hecarriedheavybags C.hewalkedtoofast D.hehelpedthepoormancarryapaperbag 2.Thewritergavethepoormansomefruitbecause. A.hecouldn'tcarrysomuchfruit B.heknewtheman'sdaughterlikedthefruit C.hewantedtohelpthepoorman D.thepoormanaskedhimforsomefruit 3.Thepoorman'sdaughtercouldn'tgetthatday. A.anewskirt B.asandwich C.somedrink D.deliciousfruit 4.WhichofthefollowingisTRUEaccordingtothepassage? A.Thepoorman'sdaughtermightbesad. B.Itwasthepoorman'sdaughter'sbirthdaythatday. C.Thepoormanhadnomoneytobuysuchdeliciousfoodforhisdaughter. D.Givingsometimescostsmuch. 5.Thepassagemainlytellsus. A.gettinghelpishappy B.nottobeapoorman C.togiveothersfruit D.givingisgetting.
10分Ifyouwatchtheskyforaboutanhourafterthesungoesdownyoumayseesomemovingstars.Butthey'renotreallystars.They'reman﹣madesatellites.AndthebiggestofallistheInternationalSpaceStationISS.FromMaytoJulyisthebestseasontowatchtheISSflyingovertheearth.Andpeoplecanseeitwiththeireyes. TheISSisthebiggestsatellite人造卫星andscientistswanttoliveonit.Theythinkthatthebestwaytolearnmoreaboutspaceistolivethere. Whenthespacestationisfinisheditwillbelikeacityinspace.Peoplewillstayandstudytherewithmanyofthethingstheyhaveathome.Laboratorieslivingroomsandpowerstationsarebeingbuilt.TheISSisthemostexpensivespaceprogram.Billionsofdollarsarebeingspentoniteveryyear. ScientistshopethattheISSwillbeasteppingstoneforfuturespaceexploration探测.TheISSwillhelpusunderstandthehumanbodybetterexplorespaceandstudytheearth.ItcanhelpusmakelifeontheearthbettersaidKathrynClarkanISSscientist. SixteencountriesarepartoftheprogramtheUSRussiaCanadaJapanBraziland11Europeancountries.Chinaisn'tanISScountrybutithashelpedwithsomeoftheexperiments.In2003ChinasentsomericeuptotheISStofindoutwhatspacewoulddotoit. 1.TheInternationalSpaceStation. A.isreallyabigcityinspace B.isthebiggestman﹣madesatellite C.canonlyhelpusexplorespace D.ismainlybuiltbytheUSAandRussia 2.Fromthepassageweknowthat. A.buildingtheISSisonlyforscientiststolivethere B.scientistscandoanythingtheylikethere C.peoplecanseetheSpaceStationatanytime D.sixteencountriesaremembersofthespaceprogram 3.Thephraseasteppingstoneprobablymeans. A.滑梯 B.巅峰 C.垫脚石 D.走廊 4.ChinasentsomericeuptotheISSisprobablyto. A.beusedasastronauts'food. B.sellittoaliens C.dosomescienceexperiments. D.makeitgrowbetterinspace 5.Whichofthefollowingisn'tmentionedinthispassage? A.ChinawilljointheISSinthefuture. B.ThescientistsarebuildinglivingroomsforthemintheISS. C.TheISSwillbemoreusefulinthefuture. D.TheISScoststhemembersof16countriesplentyofmoneyeveryyear.
已知两数和等于-6积等于2求这两个数．
已知方程3x²+2x-3=0的两根为x1x2求下列代数式的值1x12+x2223x1-x2
10分用方框里所给词的适当形式填空. othersolvetwoharmwastereporthealthmakelifefor FoodsafetyhasrecentlybecomeamoreandmoreseriousproblemformostChinesepeople.Unsafefoodcanbefoundnowandtheninthemarketorintherestaurantswhichhasattractedalotofpublicattention.Itis1thatthesefoodincludessubstandardmilkpowdertaintedsteamedbuns馒头illegalcookingoilporkwithleanmeatpowderandsoon. Unsafefoodis2inmanyways.Firstitisa3ofresource.4somepeopleevencan'tbelievetherealproducts.Aboveallitisbad5people'shealth.Ifweunluckilybuysomeunsafefoodour6willbeseriouslythreatened威胁. Sowhatusefulthingscanwedotohelpourselveseat7?Ononehandstrictlawsshouldbe8topunishthosepeoplewhoproduceandsellunsafefood.Onthe9handpeopleshouldlearnhowtotellsafegoodsfromunsafeones.Atthesametimegovernmentmustdomoreeffectivethings10theproblemsaboutfood. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10.
已知关于x的方程x²+mx-2n=0的两个根是-3和1求m和n的值．
2分我会给你五分钟的时间算出这道题. I'llgiveyoufiveminutesthisproblem.
从地面竖直上抛一物体A同时在离地面某一高度处有另一物体B自由落下两物体在空中同时到达同一高度时速率都为v则下列说法中正确的是
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