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仔细阅读下面解方程组得方法然后解决有关问题解方程组时如果直接消元那将时很繁琐的若采用下面的解法则会简
阅读下列解方程组的方法然后解决有关问题．解方程组时我们如果直接考虑消元那是非常麻烦的而采用下面的解法
解方程组
解方程组
我们知道解二元一次方程组的基本思想方法是消元那么解方程组宜用______法解方程组宜用______法
已知方程组不解方程组则5x＋y＝.
解方程组.
解方程组
解方程组.
解方程组.
解方程组代入法及加减法两种方法解方程
解方程组
解方程组
解方程组
解方程组时比较适宜的消元法是______解方程组时比较适宜的消元法是________.
已知下列非齐次线性方程组ⅠⅡ 1求解方程组Ⅰ用其导出组的基础解系表示通解． 2当方程组中的参数m
解方程组
马虎与粗心两位同学解方程组时马虎看错了m解方程组得粗心看错了n解方程组得试求:1常数mn的值;2原方
设A是m×s矩阵曰是s×n矩阵则方程组ABx=0与方程组Bx=0是同解方程组的充分条件是
r(Ａ)=n．
r(Ａ)=s．
r(Ｂ)=s．
r(Ｂ)=n．
已知方程组不解方程组则x＋y＝__________.
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阅读短文从方框中选择适当的词并用其正确形式填空使短文通顺意思完整.每空限填一词每词限用一次.方框中有两个词是多余的. Weneedpatienceinmanyways.Itplaysaveryimportantpartinourlives.Whenyoushowpatienceyouappearfriendlytopeoplearoundyou.Somepeopleseemnaturallymorepeacefulthan1butsuchskillscanbelearned.Eachofthefollowing2mayhelpyou. Breathe3Ifyoufeelyouarelosingyourpatiencestandorsitinaquietplacewith4else.Breatheinslowly5yournoseholdyourbreathforafewsecondsandthenbreatheoutslowlythroughyourmouth.Whenyouare6youcanalsousethiswaytorelax. Beunderstanding.Beforeyou7apersonsomethingnewthinkabouthisknowledgeandexperienceasabeginner.Hemightknownothingabout8youwillteach.Learning9timesotrytobepatient.Puttingyourselfinothers'shoeshelpsyoustaypatientandhelpful. Behumorous.Laughingmakesyoueasytogetalongwith.Getinthehabitof10indifferentsituations.Keeplaughingnomatterwhatdifficultiesyouhave.Insteadofgivingupwhatyoushoulddoistobepatientandwaitforyourchances. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10.
OneBeltOneRoad一带一路willhelptomarketsforChinaaswellasothercountriesalong. A.putup B.lookup C.takeup D.openup
﹣HaveyouseenmovienamedHindiMedium起跑线onApril42018? ﹣Ofcourse.It'sreallywonderfuloneespeciallythestoryofeducationforkids. A.anthe B.thea C.aa D.thethe
A.Inabank. B.Yes.sure. C.She'sanurse. D.Bymistake. E.Ioverslept. 1.Howwerethepotatochipsinvented? 2.Whywereyoulate? 3.Couldyoupleasesweepthefloor? 4.What'syourcousinsister? 5.Wheredoesyoursisterwork?
Villagersarehealthierthanthepeoplewholiveincities.Onereasonforthisisthattheairincountriesis1freshthantheairinsmokycities.Villagersarebreathingfreshcleanairalldayin2fieldbuttheairthatthepeopleincitiesarebreathingisalwaysfilled3smokeanddust.Wecannotlivewithoutair.Ifwe4stopfrombreathingevenforfiveminuteswewilldie.Badair5meanbadhealthandcertainkindsofillnesseswhichmaykillusintheend6theymaynotkillusatonce.Weallknow7wewillgetifwestayinacrowdedroomforalongtime.Afterawhilewebegintofeelvery8sleep.Thenourheadsbegintoache.Thelongerwestay9worsewewillfeel.Howniceitiswhenwegetoutside!Thereforewemustkeepourwindowsopensothatairinourroomsisalwaysfresh.Forpeoplewhooften10breathebadairtheymaygetsickanddieoflungdiseases. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10.
IthinkmydogTeffyisreallyamazing.Heunderstands1.Icancommunicatewithhim.Taffydoesn'tusuallysitquietly.He2wantstogoforawalk.HoweveryesterdaywhenIwasfeeling3hestayedbesidemeforhours.Taffyalwayswants4tobehappy.LastweekIwasmadatmybrother.Iwasshoutingathim5wesawourdog.Taffystandingbetweenusandhelookedverysad.MybrotherandIlaughed.ThenTaffywashappyagain.Taffyalsolikestohelpme.OnedaymyfriendsandI6football.WhenmyfriendJackmademefalloverTaffystartedto7Jack!Itwassofunny!AtanothertimeIcouldn'tfindmywatch.Taffysearchedforitforhours.Hedidn't8.Hefoundmywatchfinally!Ireallylovemydog!1.A.him B.her C.me D.it 2.A.never B.seldom C.sometimes D.always 3.A.good B.sick C.relaxed D.warm 4.A.everybody B.somebody C.nobody D.anybody5.A.before B.after C.if D.when 6.A.play B.wereplaying C.played D.areplaying 7.A.findout B.lookfor C.runafter D.dealwith 8.A.giveup B.wakeup C.getup D.pickup
﹣﹣﹣HowdotheBritishpeopleusuallystarta? ﹣﹣﹣Theystartitwithsubjectslikeweatherandholiday. A.conversation B.discussion C.introduction D.instruction
Itcanbevaluableorharmfuldependingonwhatwedowithit. A.both B.either C.neither D.all
Takingawayacity'srubbishisabigjob.Everydaytruckscomeintoacitytocollectit.Mostrubbishismadeupofthingswecan'teatoruse.Ifwekeptthesethingswewouldsoonhaveamountainofrubbish. Insomecitiestherubbishiscollectedandtakenoutsideofcitytoadump.Oftenthecitydumpisplacedwherethegroundisloworthereisabighole.Thekitchenrubbishisbrokenintosmallpiecesandsentintothesewagesystem.Thesewagesystem.takesawaytheusedwaterfromtoiletsbathtubsandotherplaces. Tokeepmiceandfliesawaysomeearthisusedtocoverthenewlydumpedrubbish.Latergrassmaybeplantedontherubbish﹣filledland.Finallyahouseoraschoolmaybebuiltthereandthenyou'dneverknowthatthishadoncebeenanoldrubbishdump. Inothercitiestherubbishisburntinspecialplaces.Thefireburnseverythingbutthemetal.Sometimesthemetalcanbeusedagaininfactorieswherethingsaremadeofmetal.Thefoodpartsofrubbishareputinspecialpileswheretheyslowlychangeintosomethingcalledhumuswhichlookslikeblackearth.Itisrichwiththekindsofthingsthatfeedplantsandhelpmakethemgrow. 1.Youcanmostprobablyreadthepassagein. A.asciencebook B.aTVguide C.ahistorybook D.atelephonebook 2.Themainideaofthepassageis. A.toletusknowtakingawayrubbishisabigjob B.toexplaintheneedforrubbishcollection C.tointroducedifferentwaystotreatrubbish D.totellpeopletotakeusefulthingsoutofrubbish 3.Theunderlinedwordsewageinthepassagemeans. A.排污 B.染色 C.洗涤 D.吸尘 4.Accordingtothepassagethefoodpartsofrubbishcanbeusedagain. A.tofeedanimals B.tofeedplants C.tobuildahouse D.tomakemachines 5.Howshouldwetakecareofausedmetalboxaccordingtothepassage? A.Byburningitoff. B.Byputtingitinwater C.Bythrowingitaway. D.Byreusingandrecyclingit.
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1.Whereistheelephantfrom? A.America B.Thailand C.China D.England 2.Whatanimalscanplaythepiano? A.Thecat B.Thedog C.Themonkey D.Theelephant 3.WhichofthefollowingisTRUE? A.Thedogcantakecareofsheep. B.Theelephantcanplaybasketball. C.Themonkeycanunderstandwords. D.Youcancallinandgetamobilephone
﹣JackusuallyhelpsotherswithEnglishandwelikehimverymuch. ﹣Iagree.Astudentisalwayshelpingothersisworthbeingloved. A.whom B.which C.who D.whose
﹣I'manewreader.Couldyoutellme? ﹣Certainly.Twoweeksandyoucanrenewthem. A.howlongcanIkeepthebooks B.howlongIcankeepthebooks C.whenshouldIreturnthebooks D.whenIshouldreturnthebooks
﹣Deardaughterit'smidnight!Whydoyoustayupsolate? ﹣I'dliketogotobedearlierbutthetestpaperbehandedintomorrowmorning. A.may B.should C.can D.must
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﹣﹣Themoviewewatchedyesterdaywassowhatdoyouthinkofit? ﹣﹣Iagree.Italsomademe. A.excitedexciting B.excitingexcited C.excitingexciting D.excitedexcited
OnthelastWednesdayofeachAugusttheshopsofthesmallSpanishtownoftheBunoldon'topen.Anyonewhodoesn'tliketomatoesleavestownandthestreetsbecomefulloftourists.TheyareheretotakepartinLaTomatinatheworld'slargestvegetablefight.Foracoupleofhoursalmost50000kgsoftomatoesarelaunchedasmissiles导弹atwhoevermoves. LaTomatinastartedaroundfiftyyearsagowhenfornoreasonagroupoflocalpeoplestartedthrowingtomatoesateachother.Otherpeoplejoinedinandhadsomuchfunthattheydidthesamethingthenextyear.SincethenLaTomatinahasgrownandgrown.In2004almost20000peopletookpartinthetomatowar.Nowdaysitisthemostimportantpartofaweek﹣longfestivalinvolving包含paradeseatingdrinkingandlotsoffireworks. OnthemorningofLaTomatinaeightbigtrucksfullofsofttomatoespullintothecenterofthetown.Officialstartersclimbintothetrucksandstartthrowingtomatoesatthecrowd.Thatisthesignalthatthefightisabouttostart.Fromthenonitisawildsceneaseverybodytriestogetintothetrucktogettothetomatoes.Nobodyonthestreetsissafefromattack攻击.Andthereisnothingthelocalslikemorethanthrowingtomatoesatcamera﹣carryingtourist. Finallyaftertwohoursallthetomatoeshavebeenthrown.Everybodyistiredsweatyandcoveredwithtomatoes.Abellringstosignaltheendofthefightandeveryoneisafriendagain.Tomato﹣coveredclothingistakenoffandthrowawayandthecrowdswashthemselvesinpublicshowersdownbytheriver.LaTomatinaisoverforanotheryear. 1.Howlongdoesthetomatofightlast? A.Fortwohours B.Foraday C.Foraweek D.Forayear 2.Whatcanweknowaboutthetomatofight? A.Abellringstosignalthestartofit. B.Itcostsalmost50000kgsoftomatoeseachtime. C.IttakesplaceonthefirstWednesdayofAugust. D.Thecrowdsgobackhometowatchthemselvesafterit. 3.What'sParagraph3mainlyabout? A.Whenthetomatofightstarts? B.Wherethetomatofighthappens? C.Whatpeopledoduringthetomatofight? D.Whythelocalslikeattackingtouristswithcameras? 4.Wherecanwealmostprobablyreadthispassage? A.Inanewsweekly. B.Inaself﹣protecthandbook. C.InaChinesetextbook. D.Inatouristmagazine.
Oncetwoscrews螺丝werefriendsandtheyworkedinanengine.Onescrewwasproudofits1head.Thesecondwasonlydoingitsjobtothebestofitsability2. Onedaythesecondscrewwasalittlerusted生锈.Filledwith3thefirstscrewsaidtothesecondHow4youhavebecome?Thenitbegantolaughsohardthatitfailedtonoticethatitwasloose.Thenitdroppedoffthe5andfellintothedirtyoilbelow. Nowthesecondwasfacedwithdoingthe6oftwo.MeanwhilethefirstscrewcriedJustlookatme!I'mdirtyandallmybeautyisgone. Ashorttimelatertheowneroftheengine7itup.Heimmediatelynoticedsomethingdidn'tsoundright.Whenhe8heimmediatelysawonescrewwasmissingAhha!theownersaiditmusthaveworkeditselflooseandfellintotheoil. Hereachedintotheoilandfoundthe9screw.Lookatyou!theownersaidYou'reall10withoilhowuglyyouare!11I'llfixthatrightaway.Hereachedforaclothandwipedalltheoilanddirtoffuntilitshoneevenbrighterthanbefore.Thenheputitonthepart.Beforeheturnedawayhenoticedthesecondscrewwasalittlerusted.Withthe12hewipedtheheadcleanandbright.Thenhewalkedaway. 13theenginewasstarted.Thetwoscrewsnow14beautifulheldtheparttight.Excusememyfriendthefirstscrewsaid.Iwassobusylaughing15youthatIdidn'tnoticethatIwasworkingmyselfloose.Ishallnolongerjudgeothersbytheirlooks. 1.A.big B.sharp C.red D.shining 2.A.shyly B.quietly C.happily D.bravely 3.A.pride B.pleasure C.power D.hope 4.A.small B.weak C.ugly D.selfish 5.A.ground B.engine C.seat D.wall 6.A.work B.lesson C.problem D.travel 7.A.finished B.put C.started D.broke 8.A.drove B.returned C.repaired D.checked 9.A.miss B.tomiss C.missing D.missed 10.A.covered B.filled C.connected D.compared 11.A.And B.Or C.But D.So 12.A.key B.oil C.cloth D.tool 13.A.Finally B.Firstly C.Exactly D.Usually 14.A.none B.neither C.all D.both 15.A.for B.to C.at D.to
﹣Hihaven'tseenyouforages!Youlookfine!﹣. A.Great B.Thanks C.Ohno D.Notatall
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﹣MumI'lltakeexamsafterMayDay.I'malittlebitstressed. ﹣Believein.Ithinkyouwillmakeit. A.yourself B.you C.myself D.me
Oncetherewasafamine饥荒inthetown.Arichandkindbaker面包师sentsomebreadtotwentyofthepoorestchildren.HesaidtothemInthisbasketthereissomebreadforyou.Eachofyoucanhaveoneloaf一条面包everydayuntiltheharddaysend. Theimpatientchildrencouldn'twaittogatheraroundthebasket.Theyshoutedandfoughtforthebreadbecauseeachwishedtohavethelargestloaf.Atlasttheywentawaywithouteventhankingthegoodgentleman.ButShirleyapoorly﹣dressedlittlegirldidnotjointhem. Insteadsheremainedstandingmodestlyinthedistance.Whentheotherchildrenleftshetookthesmallestloafleftinthebasketkissedthegentleman'shandandwenthome. Thenextdaythechildrenwereasrudeasbefore.PoorshyShirleystilltookthesmallestloaf.Whenshegothomehermothercutthebreadopen.Manynewshiningpiecesofsilverfelloutofit.HermotherwasverysurprisedandsaidTakethemoneybacktothegoodgentlemanatonceforitmusthavegotintotheloafbyaccident.BequickShirley!Bequick! Butwhenthelittlegirlgavetherichmanhermother'smessagehesaidNonomychild.Itwasnomistake.Iputsilverintothesmallestloaftorewardyoubecauseyouareakindandhonestgirl.Gohomeandthemoneyisyoursnow. 1.Fromthestoryweknowthetwentychildrenlivedalife. A.happy B.poor C.rich D.comfortable 2.Therichbakergavetothechildren. A.somebananas B.somebooks C.someclothes D.somebread 3.WhentheotherchildrenshoutedandfoughtforthebreadShirley. A.stoodmodestlyinthedistance B.shoutedatthem C.joinedthem D.laughedatthem 4.Shirley'smotherletherwhenshesawthemoney. A.buysomefood B.hideitauicklv C.giveitbacktotherichman D.tellherfatherthenews 5.Thestorytellsusthat. A.it'snotimportanttosaythankstoothers B.fightingwithotherscanhelpusgetmore C.Shirley'smotherdidn'tlikeher D.akindandhonestpersonwillberewarded
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ItwasaterribledayforMrandMrsLin.Theoldcouplewasonholidayatamountainresort.Theyweretakingawalkintheearlyafternoonwhensuddenlythegroundstartedtoshake.Injusttwominuteseverything1changecompletely!Theywereinthemiddleofaverystrongearthquake! 2Linstriedtofindsomeotherpeoplefirst.Onebyonetheyfound23otherpeople.Manyweretouristsyoungandold.Soonitwasdarkanditstartedtorain3heavy.Somecriedandsomelosthope. AtthatmomentMr.Lindecidedtotakethelead.Hecalledforeveryone'sattentionandsaidTheroadsaretoodangerous.Wecan'tgodownthemountain4tomorrow.Wemuststayheretonight.ThenMr.Linandafewyoungmenwentbacktotheruins废墟5lookforfoodandblankets.Theyfoundsomebutnotenoughforeveryone.Theyoungpeoplegave6theirtotheold. AfterthatMr.Lindividedthepeopleintofivegroups.Eachgrouphadaleader.Healsocollectedallthemobilephonesandmadesureeachgrouphadone.Themobilephones7useasflashlights.Every30minutesthegroup8leaderflashedtheirmobilephonesandthelightinthedarkrainynightmadeeveryonefeelsafe. Earlythenextmorningthegroupsstartedtogodownthemountain.Itwasadifficultjourney9thegroupmembersencouragedandsupportedeachother. Aftertwelve10hourswalkingtheyfinallygotoutsafely.Bythenitwas30hoursaftertheearthquake.Everyonewastiredbuttheyfeltluckybecausetheywerepartofaspecialteam.Thisspecialteamgavethemhopeforlife. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10.
Herearethismonth'sbestmagazinesforyou!ReadyforYouNow! Parents Themostpopularmagazineforthosewhowanttoraisesmartandlovingchildren.Ithasacompletechilddevelopmentplantheadviceonyourchild'shealthandsafetyandthebestwaytoencourageyourchild'slearning. Itscoverpriceis＄26.00.Ourpriceis＄12.00. FashionGuide Theshoppingmagazinewiththebestbuysandthefashionadvice.You'llneedthembeforeyougotothestores.Whatmakesitreallyspecialisthatitgivesyoutheinformationyouneedbeforeanyoneelsehasit.Itscoverpriceis＄18.50.Ourpriceis＄15.50. BestWeekendProjects Theprojectsarechosenfrom80specialideastocreateanunusuallivingspace.Theywillchangeyourhomeandyardandcanbemadeonweekends.Andthemostimportantofalltheyareeasytofollow.Itscoverpriceis＄17.95.Ourpriceis＄13.90. OftheBeatenCartPath Thebest﹣sellingtravelbookwhichincludesover200newplacesofinterestover200newfull﹣colorphotosandall﹣newup﹣to﹣datemaps.Itincludesover1000oftheUnitedStatesmostmust﹣seedestinations目的地.Itscoverpriceis＄30.00.Ourpriceis＄19.80. 根据材料内容选择最佳答案. 1.Whichofthemagazineshasthelowestcoverprice? A.Parents. B.BestWeekendProjects. C.FashionGuide. D.OfftheBeatenCartPath. 2.AfterreadingParentsyouwillgetadviceon. A.howtoshopforparents B.children'sbestweekend C.howtotakeparentsonatrip D.children'shealthandsafety 3.TheprojectsinBestWeekendProjectswillchangeyour. A.livingspace B.fashionideas C.learningplans D.travellingdestinations 4.IfMr.Huangwantstobuyeachoneofthesefourmagazineshowmuchshouldhepay? A.＄92.45. B.＄61.20. C.＄70.90. D.＄80.45. 5.Whatcanweknowfromthepassage? A.FashionGuidegivesyouadviceonopeningstores. B.Thereareover200projectsinBestWeekendProjects. C.TherearelotsofphotosandmapsinOfftheBeatenCartPath. D.Parentsoffersyouthebestwaystoencourageyourchildrentotravel.
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