- 問題詳情:若變量滿足約束條件,則的最大值是A.12B.26C.28D.33【回答】C【詳解】目標函數可以變形爲,做函數的平行線,當其經過點A(4,4)時截距最大時,即z有最大值爲=.[點評]解決線*規劃題目的常規步驟:一列(列出約束條件)、二畫(畫出可行域)、三作(作目標函數變形式的平行線)、四求(求出最優解)....
- 30665
- 問題詳情:(2012年高考(四川文))若變量滿足約束條件,則的最大值是()A.12B.26C.28D.33【回答】C【解析】目標函數可以變形爲,做函數的平行線,當其經過點B(4,4)時截距最大時,即z有最大值爲=.【點評】解決線*規劃題目的常規步驟:一列(列出約束條件)、二畫(畫出可行域)、三作(作目標函數...
- 5675
- Theexoplanet,calledWASP-12b,isagasgiant,likeJupiter.WASP-12bisagaseousplanet,about1.5timesthemassofJupiter,andalmosttwicethesize.被叫作WASP-12b的行星是目前發現的最熱的行星(約4,000華氏度,或約2,200攝氏度),相比於任何一顆已知的行星,它離執行的恆星最近。...
- 25295
- 問題詳情:Boltrunstobigwin (33)_______youareafanofathleticsornot,chancesarethatyouhaveheardofUsainBolt---thefastestmanontheplanet.Afterthe29-year-oldJamaicanhadwonvictoriesinthe100and200metermen’sdashes,Aug29sawhimtakehome(34)_______thirdgoldmedalina...
- 32788
- 問題詳情:有理數-32,(-3)2,|-33|,按從小到大的順序排列是( ) A.<-32<(-3)2<|-33| B.|-33|<-32<<(-3)2C.-32<<(-3)2<|-33| D.<-32<|-33|<(-3)2【回答】C知識點:有理數的乘方題型:選擇題...
- 15762
- 問題詳情:33°15′16″×5.【回答】33°15′16″×5=165°+75′+80″=165°+76′+20″=166°16′20″知識點:角題型:計算題...
- 23691
- 問題詳情:已知*A={x|x2+ax+12b=0}和B={x|x2-ax+b=0},滿足(∁RA)∩B={2},A∩(∁RB)={4},求實數a,b的值.【回答】解:由條件(∁RA)∩B={2}和A∩(∁RB)={4},知2∈B,但2∉A;4∈A,但4∉B.將x=2和x=4分別代入B,A兩*中的方程得即解得a=,b=-即爲所求.知識點:*與函數的概念題型:解答題...
- 29909
- 問題詳情:已知3x3y2與﹣2x3my2是同類項,則4m﹣24的值是()A.20B.﹣20C.28D.﹣28【回答】B考點:同類項. 分析:根據同類項的概念求解.解答:解:∵3x3y2與﹣2x3my2是同類項,∴3m=3,∴m=1,則4m﹣24=4﹣24=﹣20.故選B.點評:本題考查了同類項的知識,解答本題的關鍵是掌握同類項定義中的兩個“相同”:相同字母的指數相同...
- 24308
- 問題詳情:二氧化碳的相對分子質量爲()A.44gB.44C.28D.28g【回答】考點:相對分子質量的概念及其計算..專題:化學式的計算.分析:根據相對分子質量爲構成分子的各原子的相對原子質量之和;相對分子質量單位是“1”,不是“克”,常常省略不寫;進行分析解答.解答:解:二氧化碳的相對分子質量爲12+16...
- 29805
- 問題詳情:同一主族的兩種元素的原子序數之差不可能是()A.16 B.26C.36 D.46【回答】解析:選D以惰*元素的原子序數爲特例,惰*元素的原子序數分別爲2、10、18、36、54、86、118,則16=18-2,26=36-10,36=54-18,A、B、C項均有可能,D不可能。知識點:元素週期律題型:選擇題...
- 30177
- 33ofLife'sMostPowerfullessons.SeeFigure33forthecorrectplacement.Economiststhoughttheindexwoulddropto33.AnalysisofEndometrialStromalSarcoma-33CasesReportTheexceptionistheyen,undervaluedby33%.ResearchAdvancesinIL-33andReceptorST2Lastyear,carsaleswereu...
- 19429
- 問題詳情:Areyouplanninganewjobornewcareer?(33)______ ______theongoingeconomicslowdownmeansmostindustriesstillfacecutbacks(裁員),thereisonefieldthat’slikelytogrowsteadilyinthefuture:HealthCareField.Jobopportunitiesinhealthcareareontheriseandexpectedt...
- 27644
- 問題詳情:爲了求1+3+32+33+…+3100的值,可令M=1+3+32+33+…+3100,則3M=3+32+33+34+…+3101,因此,3M﹣M=3101﹣1,所以M=,即1+3+32+33+…+3100=,仿照以上推理計算:1+5+52+53+…+52015的值是.【回答】.【考點】1E:有理數的乘方.【分析】根據題目資訊,設M=1+5+52+53+…+52015,求出5M,然後相減計算...
- 18040
- 問題詳情:請從33-A或33-B兩題中任選一個作答,若兩題均作答,按33-A計分。33-A 33-B 大理石 (1)實驗室用高錳*鉀製取氧氣的化學方程式爲 。(2)*收集到的氣體爲氧氣的方法是 。(1)用大理石和稀鹽*製取二氧化碳的化學方程式爲 。(2)檢驗二氧化碳已經收集滿的方...
- 25375
- 問題詳情:(-3)×(-0.12)×(-2)×33;【回答】-30 知識點:有理數的乘除法題型:計算題...
- 22327
- 問題詳情: 33.__________ SongZuyingisthemostfamoussopranoinChina.IntheeyesoftheChinesepeople,SongZuyingisthestarofart.Shewasborninabeautifulplace--GuzhangCountyinWestHunan.Inrecentyears,shehasbeenawardedmanyhighestprizesinvariousmusiccontests...
- 24749
- 問題詳情:AmericansandArabsaredifferent 33 itcomestotheirspacehabits.Arabswouldratherhaveclosecontact.Dr.Hallhasexplainedthat 34 (belong)toatouchcultureandinconversation,theArabsalwaysenvelop(包裹)theotherperson.Theyholdhishand,lookintohiseye...
- 23706
- 問題詳情:KeepingadiaryinEnglishisoneoftheeffectiveways 33 (improve)ourEnglishwritingability. Comparedwithotherformsofwriting,itisshorterandtakes 34 (little)time.ItcanhelpustodevelopthehabitofthinkinginEnglish.Ifwepersist(堅持)inthispracti...
- 30829
- 問題詳情:如果a、b爲實數,滿足+b2-12b+36=0,那麼ab的值是_______.【回答】 -知識點:實數題型:填空題...
- 18297
- 問題詳情:Lastmonth,I(33)_______(return)toAustraliatoattendmyeldersister’swedding.Althoughitwasaverymodernwedding,mysisterkeptonetradition(34)_______comesfromanoldEnglishpoem.Thepoemsaysthatabridemustwear:“Somethingold,somethingnew,somethingborroweds...
- 32855
- 問題詳情:計算(﹣3)+(﹣9)的結果是()A.﹣12B.﹣6C.+6D.12【回答】A知識點:各地中考題型:選擇題...
- 29428
- 問題詳情:Myhometowniscloseto (33) magnificentriver.Atpresent,anewthemeparknamed“WaterWorld”isbeingbuilt.Thepark (34) (consist)ofthreeparts.Itismodeledafterlifeintheocean.FishLifeisintheeast.Youcanhavealookat (35) (vary)kindsoff...
- 31750
- 問題詳情:ADreamRealizedZhaoYang,33,anemployeeofaFrenchcompanyinBeijing,whohastraveledextensivelyintheUnitedStatesbymotorbike.IhavebeenaddictedtoHarley-DavidsonmotorcyclessinceIwasyoung,andknowingthatmotorcycle-relatedcultureisverypopularintheUS,Idecid...
- 12706
- 問題詳情:Thebelief(33)_________animalscanpredictearthquakeshasbeenaroundforcenturies.In373B.C.,it’srecordedthatanimals,includingrats,snakesandweasels(鼬鼠),desertedtheGreekcityofHelicesjustdaysbefore(34)________quakedestroyedtheplace.Sincethen,thereh...
- 27420
- 問題詳情:Fear(33)______befeltintheheartaswellasinthehead,accordingtoastudythathasfoundalinkbetweenthecyclesofabeatingheartandthechanceofsomeonefeelingfear.Testsonhealthyvolunteersfoundthattheyweremorelikelytofeelasenseoffearatthemomentwhentheirheartsa...
- 27333