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若3x=8，3y=4，则3x﹣y的值是 ．
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代数式4x3﹣3x3y+8x2y+3x3+3x3y﹣8x2y﹣7x3的值
与x，y有关
与x有关
与y有关
与x，y无关
若x=y则下列式子①y﹣1=x﹣1②3x=﹣3y③1﹣x=1﹣y④3x+2=2y+3正确的有
1个
2个
3个
4个
若M•3x﹣y2=y4﹣9x2则多项式M.为
﹣（3x+y
2
）
﹣y
2
+3x
3x+y
2
3x﹣y
2
3x﹣yy+3x﹣4x﹣3y4x+3y
抛物线y=3x2y=-3x2y=x2+3共有的性质是
开口向上
对称轴是y轴
都有最高点
y随x值的增大而增大
若实数xy满足x+2≤y≤3x则x+y的最小值是
2
3
4
5
有这样一道题计算2x3﹣3x2y﹣x3﹣2xy2+y3+﹣x3+4x2y﹣y3的值其中x=2y=﹣1
抛物线y=3x2+2x﹣1向上平移4个单位长度后的函数解析式为
y=3x
2
+2x﹣5
y=3x
2
+2x﹣4
y=3x
2
+2x+3
y=3x
2
+2x+4
求下列函数图象的开口方向对称轴及顶点坐标并指出当x取何值时y的值随x的增大而减小.1y＝x2－4x－
若3x﹣y+52+|2x﹣y+3|=0则x+y的值为
2
﹣3
﹣1
3
若xy满足约束条件则z=3x–y的最小值为_____________.
已知3x﹣y=3a2﹣6a+9x+y=a2+6a﹣9若x≤y则实数a的值为.
若﹣4xay+x2yb=﹣3x2y则a+b=.
1求函数fx=3x4-4x3-12x2+1在[-33]上的最大值最小值2求曲线的y=fx=x-3x2
已知xy满足x﹣12+y+22=4求S=3x﹣y的最值.
先化简再求值当|x﹣2|+y+12=0时求[3x+2y3x﹣2y+2y+x2y﹣3x]÷4x的值．
试说明无论xy取何值时代数式x3+3x2y﹣5xy+6y3+y3+2xy2+x2y﹣2x3﹣4x2y
化简求值已知xy满足x2﹣4x+4+=0求代数式3x+y2﹣33x﹣yx+y﹣x﹣3yx+3y的值.
化简求值当|x﹣2|+y+12=0时求[3x+2y3x﹣2y-2y+x3x-2y]÷4x的值.
下列等式变形错误的是
若x﹣1=3，则x=4
若
x﹣1=x，则x﹣1=2x
若x﹣3=y﹣3，则x﹣y=0
若3x+4=2x，则3x﹣2x=﹣4
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DearSirorMadam I'mLiHuathemiddleschoolstudentfromChina.IreadtheannouncementofthesummercampthatyouhavepostedontheInternetandthatIaminterestedinit.IknowthatyouwelcomingstudentsfromdifferentcountriesbutI'dliketotakepartinit.I'vebeenlearningEnglishfor10yearsandIspeakfluentlyEnglish.WhatismoreI'llbeabletotellstudentsfromanothercountriesaboutChinaandlearnabouttheircountriesaswell.IhopeIwillbeacceptedamemberofyoursummercamp. Hereareyouremailaddressandphonenumbers:lihua@123.com;12345678. Lookingforwardtohearfromyousoon. Yours LiHua
HannahTaylorisaschoolgirlfromManitobaCanada.OnedaywhenshewasfiveyearsoldshewaswalkingwithhermotherindowntownWinnipeg.Theysawaman1outofagarbagecan.Sheaskedhermotherwhyhedidthatandhermothersaidthatthemanwashomelessandhungry.Hannahwasvery2.Shecouldn'tunderstandwhysomepeoplehadtolivetheirliveswithoutshelterorenoughfood.Hannahstartedtothinkabouthowshecould3butofcoursethereisnotalotonefive﹣year﹣oldcandotosolve解决theproblemofhomelessness. LaterwhenHannahattendedschoolshesawanotherhomelessperson.Itwasawoman4anoldshoppingtrolley购物车whichwaspiledwith5.Itseemedthateverythingthewomanownedwasinthem.ThismadeHannahverysadandevenmore6todosomething.Shehadbeentalkingtohermotheraboutthelivesofhomelesspeople7theyfirstsawthehomelessman.Hermothertoldherthatifshedidsomethingtochangetheproblemthatmadehersadshewouldn't8asbad. HannahbegantospeakoutaboutthehomelessnessinManitobaandtheninotherprovinces.Shehopedto9hermessageofhopeandawareness.ShestartedtheLadybugFoudationanorganizationaimingatgettingridofhomelessness.Shebeganto10BigBossesluncheswhereshewouldtrytopersuadelocalbusinessleadersto11tothecause.Shealsoorganizedafundraising募捐driveinLadybugJarstocollecteveryone′ssparechangeduringMakeChangemonth.Morerecentlythefoundationbegananother12calledNationalRedScarfDay﹣adaywhenpeopledonate$20andwearredscarvesinsupportofCanada′s13andhomeless. ThereisanemergencyshelterinWinnipegcalledHannah′sPlacesomethingthatHannahisvery14of.Hannah′sPlaceisdividedintoseveralareasprovidingshelterforpeoplewhenitissocoldthat15outdoorscanmeandeath.InthemorethanfiveyearssinceHannahbeganheractivitiesshehasreceivedalotof16.Forexampleshereceivedthe2007BRICKAwardrecognizingthe17ofyoungpeopletochangetheworld.But18allthisHannahstillhasthe19lifeofaWinnipegschoolgirlexceptthatshepaysregularvisitstohomelesspeople. Hannahisoneofmanyexamplesofyoungpeoplewhoaremakinga20intheworld.Youcantoo! 1A.jumping B.eating C.crying D.waving 2A.annoyed B.nervous C.ashamed D.upset 3A.behave B.manage C.help D.work 4A.pushing B.carrying C.buying D.holding 5A.goods B.bottles C.foods D.bags 6A.excited B.determined C.energetic D.grateful 7A.since B.unless C.although D.as 8A.sound B.get C.feel D.look 9A.exchange B.leave C.keep D.spread 10A.sell B.deliver C.host D.pack 11A.contribute B.lead C.apply D.agree 12A.campaign B.trip C.procedure D.trial 13A.elderly B.hungry C.lonely D.sick 14A.aware B.afraid C.proud D.sure 15A.going B.sleeping C.traveling D.playing 16A.praises B.invitations C.replies D.appointments 17A.needs B.interests C.dreams D.efforts 18A.for B.through C.besides D.along 19A.healthy B.public C.normal D.tough 20A.choice B.profit C.judgement D.difference
ThemanwhowalkedintoDaveCutlip'stattooparlor纹身店inBrooklynPark.MarylandinJanuarywastoughtomiss.Hisfaceboreagang帮派tattoo.ThemansoughtCutlip'shelpincoveringuphisviolentpast.Hewasdeterminedtoturnoveranewleaf.IcouldseethehurtinhiseyesCutlip49toldTheWashingtonPost. Cutlipcouldn'thelptheman﹣thetattooweretooclosetotheeyes.Butitgothimthinking.Manyyoungpeoplegettattoosthatheycometoregret.Afewcanmarkthemfortherestoftheirdays.Thenthey'realwaysgoingtobeavictim.saidCutlip.IfIcanhelpthat'smyultimate最终的goal. Inkingoveratattoocostshundredsofdollarsandgettingoneremovedbylaser激光isevenpricier.SoCutlipdecidedhewouldhelpbyhidingracistorgang﹣relatedtattoosforfree.HeputthewordoutviaFacebook:Sometimespeoplemakebadchoicesandsometimespeoplechange.Webelievethereisenoughhateinthisworldandwewanttomakeadifference. OnemanCaseySchaffershowedupwiththewordwhiteononeforearmandpowerontheother.He'dservedayearinprisonondrugchargeshetoldTheWashingtonPostandhadjoinedawhitegrouptherebecausetheytookcareofme.Ithoughtofitaspayingthemback.Butemployerswouldtakeonelookatthetattoosandturnhimdown.SohehadCutlipobscure使不分明oneofthewordswithaheatandrosesandtattooaneagleovertheother. Cutliphasdoneninesuchjobseachofwhichtookseveralhours.HetoldPeoplethataclient顾客lethimknowthathequicklyfoundajoboncehistattoowasobscured.SuchvictoriesinspiredCutliptofoundtheRandomActsofTattooprojectwiththreelike﹣minded志同道合的tattoostudiosfromaroundthecountryandnowhundredsofclientsareonawaitlist.AshetoldNationalPublicRadio.Ifwecanjusterasehatethenwe'redoingsomething. 1Whatdoweknowaboutthemanwhohadagangtattoo? A.Hiseyeswerebadlyhurt. B.HerefusedCutlip'shelp. C.Tattooscoveredallofhisbody. D.Hedecidedtostartalloveragain. 2HowdidCutliphelpCasey? A.Bycoloringthetattoos. B.Byinkingoverthetattoos. C.Bychangingthetattoos'patterns. D.Byremovingthetattoosbylaser. 3WhydidCaseyaskCutlipforhelp? A.Togetemployed. B.Tojoinanothergroup. C.Tohidehisangeratwhites. D.Topleasehiscurrentemployer. 4WhatcanbeinferredabouttheRandomActsofTattooproject? A.It'saworldwideproject. B.It'saco﹣foundedproject. C.Itsclientsarelike﹣minded. D.Itsclientsdon'thavetowaitlong.
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PerhapstheonlytestscorethatIrememberisthe55IgotwhenIwasinhighschool. Thetestwasthefinalforacourse.Irememberwaiting1asmyteacherMr.Rightpassedoutourpapersonebyone.Itwasarather2test.Iheardmyclassmatesgroaning叹息andIcouldtellbythegroansthatthescoresweren'tlooking3. Mr.Rightputmypaperonmydesk.Thereinbigrednumberscircledtodraw4wasmyscore55! Iloweredmyheadand5thescoreupquickly.A55isnotsomethingthatyouwantedyourclassmatestosee.Thescoreswerenotverygoodnoneofyou6Mr.Rightsaid.Thehighestscoreintheclasswasa55. A55.That'sme! 7mysadlookdidn'tlooksobad.Ihadthehighestscore.Ifeltalotbetter. Iwalkedhomealonethatdaywiththelowbuthighscore.MyfatherknewthatIhadabig8thatdayandaskedmeassoonasIgothome9didyoudoinyourtest? Igot55Isaid. A10nowstoodonmyfather'sface.IknewIhadto11immediately.ButDadIhadthehighestscoreintheclassI12stated.Ithoughtthatexplanationwouldmakeadifference. You13!myfatherreplied.Butit'sthehighest!I14. Idon't15whatscoresothershadyoufailed.What16iswhatyoudo!Myfatherfirmly坚定地said. Foryearsmyfatherwas17thatway.Itdidn'tmatterwhatothersdiditonlymatteredwhatIdidandthatIdidit18. Weoftendon'tunderstandthe19ofgoodparentsuntilweourselvesstandintheparents'shoes.Myfather's20havecarriedmethroughoutlife. 1A.anxiously B.proudly C.shyly D.tiredly 2A.boring B.difficult C.strange D.interesting 3A.poor B.true C.good D.suitable 4A.attention B.interest C.opinions D.lessons 5A.checked B.covered C.turned D.tore 6A.failed B.missed C.passed D.won 7A.Hurriedly B.Finally C.Suddenly D.Slowly 8A.event B.issue C.show D.test 9A.When B.Why C.What D.How 10A.tear B.frown C.panic D.smile 11A.insist B.explain C.prove D.admit 12A.impatiently B.embarrassedly C.nervously D.proudly 13A.cared B.failed C.regretted D.lost 14A.advised B.insisted C.realized D.promised 15A.care B.imagine C.know D.understand 16A.challenges B.inspires C.improves D.matters 17A.always B.seldom C.still D.once 18A.bravely B.firmly C.excellently D.hurriedly 19A.courage B.kindness C.trouble D.wisdom 20A.examples B.blames C.words D.ideas
ThemeetingissforFridayafternoon.
金属和金属材料在生活中有广泛用途． 1高铁列车电路中的导线大多是用铜制的这是利用了铜的延展性和性． 2用一氧化碳和赤铁矿炼铁的化学方程式为． 3车体表面除美观外主要是为了防止外壳生锈其防锈原理是．用稀盐酸除铁锈的化学方程式是．
将3.2g某红棕色粉末与足量的碳充分反应将产生的二氧化碳气体全部通入足量的澄清石灰水中得到3g白色沉淀．计算 1生成二氧化碳的质量 2红棕色粉末中氧元素的质量分数．
Manypeopleholdtheopinionthatisnouseworkhardbecausetheyarenotbornintoprivilegedfamilies.
化学小组同学在某工厂废水处理池中提取一瓶含有AgNO3CuNO32和AlNO33的工业废水样品带回实验室．静置取上层清液加入锌粉充分反应后过滤得到滤液甲和滤渣乙．请完成以下探究不考虑杂质干扰． 【提出问题】滤渣乙是什么 【做出猜想】小明认为滤渣乙是银小东认为滤渣乙是银和铜小华认为滤渣乙是银铜和铝你认为滤渣乙还可能是． 【交流讨论】大家经过讨论后认为小华的猜想错误理由是． 【实验探究】设计实验探究滤渣乙的成分请填写下列空白 【反思交流】通过交流大家认为此时滤液甲中含有的溶质是．
Inspiringyoungminds! TOKNOWMagazineisabighitintheworldofchildren'spublishingbringingauniquecombinationofchallengingideasandgoodfuntoyoungfanseverymonth. Soundstoogoodtobetrue? Takealookonline﹣evidenceshowsthatthousandsofteachersandparentsknowagoodthingwhentheyseeitandrecommendTOKNOWtotheirfriends. HappyBirthdayAllYear! Whatcouldbemorefunthanagiftthatkeepscomingthroughtheletterboxeverymonth?Thefirstmagazinewithyourgiftmessagewillarriveintimeforthespecialday. SUBSCRIBENOW □AnnualSubscription Europe£55RestofWorld£65 □AnnualSubscriptionwithGiftPack IncludesaMammothMapaPassportPuzzleBookletandSubscription Europe£60RestofWorld£70 RefundPolicy﹣thesubscriptioncanbecancelledwithin28daysandyoucangetyourmoneyback. 1WhyisTOKNOWaspecialmagazine? A.Itentertainsyoungparents. B.Itprovidesseriousadvertisements. C.Itpublishespopularsciencefictions. D.Itcombinesfunwithcomplexconcepts. 2WhatdoesTOKNOWofferitsreaders? A.Onlinecourses. B.Articlesonnewtopics. C.Lecturesonabalancedlife. D.Reportsonscientificdiscoveries. 3Howmuchshouldyoupayifyoumakea12﹣mouthsubscriptiontoTOKNOWwithgiftpackfromChina? A.£55. B.£60. C.£65. D.£70. 4SubscribersofTOKNOWwouldget. A.freebirthdaypresents B.fullrefundwithin28days C.membershipoftheTOKNOWclub D.chancestomeettheexpertsinperson
Iafornotbeingabletojoinyoufordinner.
Thedoctorsaiditwasonlyaslightwound.Whatar.
Mostpeoplesayyesmuchmorereadilythanno. Afriendismovinghousethisweekendandwouldlikesomehelpandyouagree.Butwhatyoureallywantisacoupleofquietdaysrelaxingathome.Oraroommatespendstheentireweekendsplayingvideogamesandwantstoborrowyourhomeworkforreference.Butyou'vejustfinisheditaftertakingawholedaytoworkhard. Manypeoplesayyestothesekindsofrequests.Theytendnottoconsidertheirowninterestsandfeelingsandareoftenangrywiththemselvesafterwards. Sayingnorequirescourageandconsiderablepracticeinfactaccordingtopsychologists. EveryonewantstobelikedsaysGabrieleSteinkiaGermanpsychologist.Saying‘no'riskslosingtheaffectionofthepersonaskingthefavororevenajob. Theresultisthatmanypeoplesayyesjustforkeepingthepeace.Butexpertssaythisisregrettable.Anyoneshouldhavetherighttosayno. Infactrejectingarequestcanevenhelptostrengthenarelationshipbecauseitexpressesatruefeeling. Butforpeoplewhoareusedtoagreeingtoeveryrequestchangingcanbealonganduncomfortablelearningprocess. MostpeoplebelievethatIfIsay‘no'I'lllosetheaffectionoftheperson.Buttheaffectionisimportanttome.Thiswayofthinkingcanbereplacedbythis:IfheonlylikesmebecauseIalwaysdowhatsuitshimthenthepriceofhisaffectionistoohighinthelongterm. Steinkisaysthekeyistalkingtotheotherpersontofindamutual相互的solution.Oneneedstopresentthesituationfromone'sownpointofviewandtosuggesthowthesituationcanbedealtwithtotheadvantageofbothparties.Theotherpersonmusthavethefeelingthathisinterestsarebeingconsidered. WhentherefusalisnotacceptedSteinkiadvisesgivingthereasonscalmlyagainuntilthepersongetsthemessage. 1Mostpeoplesayyesmuchmorereadilythannobecause. A.theydon'tcareabouttheirowninterestsandfeelings B.theydon'tknowtheywillregretafterwards C.theyhavealreadybeenusedtosayingyes D.theycaremoreaboutothers'affection 2Intheopinionofpsychologists. A.peopleneedalotofpracticetosayno B.peopleshouldsayyestokeepthepeace C.sayingnomeanslosingajob D.peoplehavetherighttobeliked 3AccordingtoSteinkiwhatshouldyoudoifyouwanttorefusetheotherperson'srequest? A.Justsayyoucan'thelphim. B.Saysorrytohim. C.Refusehimclearly. D.Talktotheotherpersontofindamutualway.
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x﹣1=x，则x﹣1=2x 若x﹣3=y﹣3，则x﹣y=0 若3x+4=2x，则3x﹣2x=﹣4
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