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下列选项中,能使关于x的一元二次方程式ax2-4x+c=0一定有实数根的是( )
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关于x的方程ax2﹣3x+2=0是一元二次方程则
a>0
a≥0
a≠0
a=1
下列四个说法中正确的是
一元二次方程
有实数根;
一元二次方程
有实数根;
一元二次方程
有实数根;
一元二次方程x
2
+4x+5=a(a≥1)有实数根.
已知一元二次方程ax2+bx+c=0a≠0b≠0有一根是1常数项为0那么这个一元二次方程可写为___
判断一元二次方程式x2-8x-a=0中的a为下列哪一个数时可使得此方程式的两根均为整数
12
16
20
24
若关于x的方程ax2﹣4x﹣1=0是一元二次方程则a满足的条件是
a>0
a≠0
a<0
a≠4
用配方法解关于x的一元二次方程ax2+bx+c=0.a≠0
下列选项中能使关于x的一元二次方程ax2﹣4x+c=0一定有实数根的是
a>0
a=0
c>0
c=0
.下列说法正确的是
形如ax
2
+bx+c=0的方程称为一元二次方程
方程(x+2)(x-2)=0是一元二次方程
方程x
2
-2x=1的常数项为0
一元二次方程中,二次项系数、一次项系数及常数项都不能为0
若关于x的一元二次方程ax+2x-1=0无解则a的取值范围是____________.
下列叙述正确的是
形如ax
2
+bx+c=0的方程叫一元二次方程
方程4x
2
+3x=4不含有常数项
一元二次方程中,二次项系数一次项系数及常数项均不能为0
(3﹣y)
2
=0是关于y的一元二次方程
下列说法错误的是
方程ax
2
+bx+c=0是关于x的一元二次方程
方程3x
2
=-4的常数项是4
若一元二次方程的常数项为0,则0必是它的一个根
方程x
2
+1=-2无解
当a_________时关于x的方程2a+4x2+4ax+3a-2=0是一元二次方程.
已知关于x的一元二次方程x2-ax+2=0的两实数根x1x2满足x1x2=x1+x2-2.1求a的值
如果关于x的一元二次方程ax2+bx+c=0有两个实数根且其中一个根为另一个根的2倍则称这样的方程为
已知关于x的一元二次方程x2+bx+c=0.从-123三个数中任取一个数作为方程中b的值.再从剩下的
已知关于x的方程k2-9x2+k+3x=0.1当k为何值时此方程是一元一次方程2当k为何值时此方程是
关于x的一元二次方程a2-1x2+x-2=0是一元二次方程则a满足
a≠1
a≠-1
a≠±1
为任意实数
若关于x的一元二次方程ax2-bx-2018=0有一根为x=-1则a+b=______.
若关于x的一元二次方程a+1x2-ax+a2-1=0有一个根为0则a=______
关于x的一元二次方程a2﹣1x2+x﹣2=0是一元二次方程则a满足
a≠1
a≠﹣1
a≠±1
为任意实数
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下表是在相同温度下三种酸的一些数据下列判断正确的是
从123456789这九个数字中任意取出不同的三个数字. 1求取出的这三个数字中最大数字是8的概率 2记取出的这三个数字中奇数的个数为ξ求随机变量ξ的分布列与数学期望.
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化学与生活社会密切相关.下列说法不正确的是
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化学与人类生产生活密切相关.下列有关说法不正确的是
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下列表示正确的是
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Imagineyourselfonaboatlookingoutatthehorizonandallyoucanseeisthewatermeetingtheskywithnolandinsightandyouaresailingstraightaheadtomeettheworld.JesseMartindoesnothavetoimagineheislivinginit. OnDec.71998at17yearsoldJessesetsailfromMelbourneAustraliaonhisboatattemptingtobecometheyoungestpersontosailaloneandnonstoparoundtheworld.HesailedsouthofNewZealandthroughtheSouthPacificaroundSouthAmericanorthontheAtlanticbacksouthpastAfricathroughtheIndianOceanandbacktoMelbourne.EvenasayoungchildJessehadbeenanadventurerwhotraveledalloverEuropeandAsiawithhisparents.BorninMunichGermanyin1981hemovedtoAustraliawithhisfamilywhenhewasonlytwoyearsold.TheymovedclosetoarainforestinCowBayabout3500kmsnorthofMelbournewheretheybuiltasmallhousewithnoelectricityorrunningwater.Jessegrewupatthebeachenjoyingtheoutdoorstoitsfullest.At14hesailedforthefirsttimewithhisfatherandbrotherBeau.Itwasafterthistripthathebegantodreamaboutsailingaroundtheworld. Jesse'sfamilyplayedanimportantrole.IwasmadetobelieveIcoulddoanythingalthoughtherewereothersthatwerenotsoencouragingorsupportivehesays.PeoplethatIlookeduptorespectedandtrustedtoldmeIcouldn't.ThankfullyItrustedmyself.Therewerepeoplethatsaidthattheboatcouldn'tbereadybythetimeIhadtoleave.Howeverthroughperseveranceandbeliefinhimselfhewasabletodowhatmanytoldhimwasimpossible. OnOct.311999morethan10monthsafterhesetsailJesseMartinwentdowninhistoryastheyoungestpersontosailaroundtheworldalonenonstopandunassisted. 1.Byencouragingreaderstoimagineasailingexperiencetheauthorwantsto. A.showhowdifficultitistobeasailor B.describewhatJesse'ssailingislike C.showhowwonderfulJesse'slifeis D.describewhatasailor'slifeislike 2.Whatcanyouknowfromparagraph2? A.Jessewasthefirstpersonwhohadsailedalonearoundtheworld. B.JessetraveledalloverEuropeandAsiawithhisparentswhenhewas17. C.JessewasborninMelbourneandgrewupatthebeach. D.Jessegrewupinasmallhousewithnoelectricityorrunningwater. 3.WhatmadeJessedecidetosailalonearoundtheworldaccordingtothepassage? A.Hischildhoodadventureexperiences. B.HisjourneystoEurope. C.Hisloveforoutdooractivities. D.Hisfirstsailingtripwithhisfamily. 4.WhatcanwelearnfromJesseMartin'sstory? A.Lifeisanunusualadventureweshouldenjoy. B.Failureisthemotherofsuccess. C.Astrongbeliefwillmakeapersonstronger. D.Greatinterestcontributestosuccess.
Idon'tencouragepeopletotakephotographslikethiswithoutpermit.
Ifyouarehungrywhatdoyoudo?Haveyourfavoritemealandstayquietafterthat?Justlikeyourstomachyourmindisalsohungry.Butitneverletsyouknowbecauseyoukeepitbusythinkingaboutyourfriendsorfavoritestars.Soitsilentlyservesyourneedsandneverletsitselfgrow.Whenmindlosesitsfreedomtogrowcreativity创造性setsafullstop.ThismightbethereasonwhyweallsometimesthinkWhathappensnext?Whycan'tIthink? Hungerofthemindcanbeactuallysolvedthroughwidereading.WhyreadingbutnotwatchingTV?Itisbecausereadinghasbeenthemosteducativetoolusedbyusrightfromchildhood.Sinceitdevelopsotherwaysofourlifewehavetotakehelpfromreading. Onceyoureadabookyourunyoureyesthroughthelinesandyourmindtriestoexplainsomethingtoyou.Theinterestingpartofthebookisstoredinyourmindasaseed种子.Nowthisseedisunknowinglyusedbyyoutodevelopnewideas.Ifitisusedmanytimesthesameseedcangiveyougreathelptorelatealotofthingswhichyouwouldhaveneverthoughtofinyourwildestdreams! Thisisnothingbutcreativity.Alsothismakesahugecontributiontoyourvocabulary.WithinnotimeyoucanstarttalkingwithyourfriendsinEnglishoranyotherlanguageandneverrunoutoftherightwords. Soguysdogivefoodforyourthoughtsbyreadingreadingandmorereading.Nowwhatareyouwaitingfor?Goandgetabook! 1.Whenyourmindishungrythebestwayis. A.thinking B.eating C.reading D.watchingTV 2.WhichofthefollowingisRIGHTaccordingtothepassage? A.Whenyoureadabookyourmindlosesitsfreedomtogrow. B.Inyourwildestdreamaseedcangrowalotofdifferentthings. C.Theinterestingpartofthebookyoureadcanhelpyoudevelopnewideas. D.WatchingTVisthemosteducativewayforustodevelopcreativityinourlife. 3.ThefollowingareadvantagesofreadingEXCEPTthat. A.readingfeedsyourhungrymind. B.readingmakescreativitysetafullstop. C.readingcanhelpyourelatealotofthings. D.readingwillcontributetoyourvocabulary. 4.What'sthepurposeofthepassage? A.Tointroduceabook. B.Topersuadeustoread. C.Toexplainhungerofmind. D.Totellushowtocreatethings.
AllI'veeverwantedisforJulieBakertoleavemealone.Forhertobackoff﹣youknowjustgivemesomespace. Itallstartedthesummerbeforesecondgradewhenourmovingvan家具搬运车pulledintoherneighborhood.Didweinvitehertogetintoourmovingvanandstartclimbingalloverboxes?No!Butthat'sexactlywhatshedidtakingoverandshowingofflikeonlyJulieBakercan. Mydadtriedtostopher.Hey!hesaidasshewasjumpingonboard.Whatareyoudoing?You'regettingdirteverywhere! Shedidn'tleavethough.Insteadsheplantedherselfonthefloorandstartedpushingabigboxwithherfeet.Don'tyouwantsomehelp?Shelookedmyway.Itsurelookslikeyouneedit. Hey!Don'tdothatmydadwarnedher.Therearesomereallyvaluablethingsinthatbox. Oh.Wellhowaboutthisone?Shemovedswiftlyovertoanotherboxandlookedmywayagain.Weshouldpushittogether! Nonono!mydadsaidthenpulledherupbythearm.Whydon'tyourunalonghome?Yourmother'sprobablywonderingwhereyouare. OhmymomknowswhereIam.Shesaiditwasfine.ThenshepointedacrossthestreetandsaidWejustliverightoverthere. Myfatherlookedtowhereshewaspointingandsighed叹息Ohboy.Thenhelookedatmeandwinked眨眼ashesaidBryceisn'tittimeforyoutogoinsideandhelpyourmother? Iknewrightoffwhatthatmeantandmanhedidn'thavetowinktwice.IsmiledandsaidSurething!thenjumpedofftheliftgateandheadedformynewfrontdoor. IheardhercomingaftermebutIcouldn'tbelieveit.Maybeitjustsoundedlikeshewasrunningaftermemaybeshewasreallygoingotherway.ButbeforeItookupthecouragetolooksheranrightpastmegrabbedmyarmandfiercelypulledmealong. Thiswastoomuch.Istoppedrunningandwasabouttotellhertogetlostwhentheweirdest诡异的thinghappened.Iwasmakingthisbigcirclemovetobreakawayfromherbutsomehowmyhandendeduptangling缠结intohers.Icouldn'tbelieveit.ThereIwasholdingthedirtymonkey'shand! ItriedtoshakeheroffbutshejustheldontightandpulledmealongsayingComeon! 1.WhendidBryceandJulieBakerfirstmeet? A.Inthesummervacationaftersecondgrade. B.Inthesummerbeforethemovingvancame. C.WhenBryce'sfamilymovedtoJulie'sneighborhood. D.WhenJulie'sfamilywasreadytomoveoutoftheneighborhood. 2.WhatdidBryceandhisdadthinkofJulieBaker? A.JulieBakerwasadirtytrouble﹣maker. B.JulieBakerwasalovelyandactivegirl. C.JulieBakerwasaveryfriendlyneighbor. D.JulieBakerwasawarm﹣heartedandhelpfulgirl. 3.WhydidBryce'sdadwinkathimashetalked? A.HewantedtoplayajokeonBryce. B.HetriedtopersuadeBrycetohelphismother. C.HeplannedwithBrycetofoolJulietoleavethem. D.HemeanttocheatBryceandJulietogobackhome. 4.Whatwouldprobablyhappennext? A.BryceandJuliewouldhaveafight. B.Juliewouldgobacktoherownhome. C.BryceandJuliewouldplaytogetherlikefriends. D.JuliewouldfollowBrycetohishometohelphismother.
VWXYZ是原子序数依次递减的五种常见元素.X元素是地壳中含量最多的元素YZ组成的气态化合物M的水溶液呈碱性W的单质在X2中燃烧产物可使品红溶液褪色V是一种历史悠久应用最广泛的金属元素.请回答 1Y元素在周期表中的位置是写出XZ两种元素组成的化合物Z2X2的一种用途. 2由以上五种元素两两组合所形成的化合物中有一种物质能与水反应生成气体且反应属于氧化还原反应请写出该反应的化学方程式. 3XYZ三种元素可组成一种强酸UM在适当条件下被U吸收生成一种盐.该盐的水溶液的pH7填“大于”“小于”或“等于”.原因是用离子方程式表示 4若将V金属投入到盐酸溶液中生成了浅绿色溶液N.N的酸性溶液与双氧水反应的离子方程式. 5有人设想寻求合适的催化剂和电极材料以Y2Z2为电极反应物以HCl﹣NH4Cl溶液为电解质溶液制造新型燃料电池试写出该电池的正极电极反应式.放电时溶液中H+向填“正”或“负”极.
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