首页
试卷库
试题库
当前位置:
X题卡
>
所有题目
>
题目详情
设变量x,y满足约束条件.目标函数z=ax+2y仅在(1,0)处取得最小值,则a的取值范围为( )
查看本题答案
包含此试题的试卷
高一下学期数学《2017-2018学年河北省石家庄市高一(下)期末数学试卷》真题及答案
点击查看
你可能感兴趣的试题
.已知变量xy满足线性约束条件若目标函数z=kx-y仅在点02处取得最小值则k的取值范围是
k<-3
k>1
-1
-3
已知变量xy满足约束条件则目标函数z=ax+2y仅在点10处取得最小值则a的取值范围是
设变量xy满足约束条件若目标函数z=a|x|+2y的最小值为﹣6则实数a等于
2
1
﹣2
﹣1
设变量xy满足约束条件若目标函数z=kx+2y仅在点11处取得最小值则实数k的取值范围是.
已知变量xy满足约束条件若目标函数z=ax+y其中a>0仅在点30处取得最大值则a的取值范围为.
设变量xy满足约束条件则目标函数z=x﹣4y的最小值为
﹣3
2
﹣9
5
已知变量xy满足约束条件1≤x+y≤4-2≤x-y≤2.若目标函数z=ax+y其中a>0仅在点31处
设变量xy满足约束条件则目标函数z=2x+4y的最大值为
10
12
13
14
设变量xy满足约束条件则目标函数z=2x+y的最小值为
2
3
5
7
设变量xy满足约束条件则目标函数z=4x+y的最大值为________.
设变量xy满足约束条件其中a>1若目标函数z=x+y的最大值为4则a的值为________.
设变量xy满足约束条件则目标函数z=x+2y的最小值为
2
3
4
5
设变量xy满足约束条件则目标函数z=y-2x的最小值为
- 7
-4
1
2
若xy满足约束条件目标函数z=ax+2y仅在点10处取得最小值则a的取值范围是
设变量xy满足约束条件则目标函数z=4x+2y的最大值为
12
10
8
2
已知变量xy满足约束条件1≤x+y≤4-2≤x-y≤2若目标函数z=ax+y其中a>0仅在点31处取
.设变量xy满足约束条件则目标函数z=2x+3y+1的最大值为__________.
设变量xy满足约束条件则目标函数z=4x+2y的最大值为
12
10
8
2
设变量xy满足约束条件则目标函数z=x2+y2的最大值为________.
设变量xy满足约束条件则目标函数z=2x+y的最大值为
热门试题
更多
Thisisagoodbook.Eachtimeyoureadityouwillfind. A.somethingnew B.newsomething C.nothingnew D.newnothing
Onlywhentheworkisdonebeabletogobackhome.A. youhave B. youwill C. willyou D. haveyou
Thelittleboymustkeepathomeorhe'llcatchacoldagainonsuchabadday.
Inmostwesternsit'scommontomoveoutwhenteenagersgrowup.
DoyouthinkJohnisaboywho's? A.carefulenough B.carefullyenough C.enoughcarefully D.enoughcareful
Ilikestudyingingroups.Butsometimeswereallyget. A.noise B.noises C.noisily D.noisy
—IsMary?—Nosheisa girl.A.twelveyearsoldfourteenyearsoldB.twelveyearsoldfourteen-year-oldC.twelve-year-oldfourteen-year-oldD. twelve-year-oldfourteenyearsold
Ifyoudon'twantthisoneyou'llhavenootherbecausewehavenooneleft.
Whenyougotothedoctorsyouoftenhaveyoureyesight视力checked.ThedoctormakesyoureadachartwithbigandsmallEsonit.Doyouknowwherethatchartcamefrom?It'scalledtheSnellenchart.twasmadebyHermanSnellenaDutch荷兰的Doctorin1863.Whenreadingthechartyoushouldstandfivemetersawayfromit.Youreyesshouldalsobeatthesameheightasthe10thlineofletters.Youshouldthenreadthelettersfromthetoplinetothebottom底部line.Thelettersgetsmallerastheygetnearerthebottom.Doctorscanfindoutifyouareshort-sightedlong-sightedorifyouhavegoodeyesightbyseeingwhatlinesyoucanread.Ifyourdoctorthinksyouneedglassesthey'lltellyoutogotothehospitaltogetsome.根据短文内容选择最佳答案. 1.Thedoctorsusetocheckyoureyesight.A.achart B.apairofglasses C.somemedicine D.amachine2.TheSnellenChartwasinventedbyandoctor. A.English B.American C.Chinese D.Dutch 3.Whenthedoctorchecksyoureyesighthewillaskyoustandmetersawayfromthechart.A.3 B.5 C.10 D.154.Ifyoucanreadallthelettersinthechartyou. A.areshort-sighted B.havebadeyesight C.havegoodeyesight D.needglasses 5.Ifyouareshort-sightedwhatwouldyoudo? A.Gotothehospitalandgetapairofglasses. B.Seethedentist. C.Drinkmorehotwater. D.Listentothesoftmusic.
能在水溶液中大量共存的一组离子是
MrGreenhassmoking.Hehasrealizedit'sbadforhealth. A.stop B.givesup C.givenup D.stopped
Everyonehaseverwhathehasdoneandfeelssad.
Althoughsheisa girlsheknowsalotofChinesecharacters汉字.A.fiveyearsold B.five-year-oldC.five-years-old D.five-year-olds
Afterhearingthegoodnewshehissonsotightlythathecouldn'tbreathe.
isnotallowedinpublicplaces.Itisbadforourhealth.
从石英砂制取并获得高纯硅的主要化学反应如下 ①SiO2+2CSi粗+2CO ②Si粗+2Cl2SiCl4 ③SiCl4+2H2Si纯+4HCl 关于上述反应的分析不正确的是
WasBoblateforclassfromgetbackhomeforhisbooks?
Theboywhobroketherulesneededpunishbytheteacher.
Isyourfatherstrictinwhatyoudothanyourmom?
AmongthestudentsLiPingneedshelpw.
亚氯酸钠NaClO2主要用于棉纺造纸业的漂白剂也用于食品消毒水处理等亚氯酸钠受热易分解.以氯酸钠等为原料制备亚氯酸钠的工艺流程如下 1提高“反应1”反应速率的措施有等. 2“反应2”的氧化剂是该反应的化学方程式为. 3采取“减压蒸发”而不用“常压蒸发”原因是. 4从“母液”中可回收的主要物质是. 5“冷却结晶”后经填操作名称即可获得粗产品.
Thegovernment'sagainstbuildanyhousesintheareawithoutpermission.
Asadrivercomesfirst.
—WhyisJack? —Hehasabadcoldandhastostayinbed. A.hunorous B.absent C.silent D.awful
Idon'tlikeaboythatoftencryforhelp.
Didshegetherhaircutinthebarbershopjustnow?
下列叙述Ⅰ和Ⅱ均正确并有因果关系的是
Theeditorwastoobusytomyletter.A.answerto B.reply C.replytoD.makeareply
如图实验装置设计正确且能达到目的是
Hisplanwontheteacher'sloud.
热门题库
更多
教案备课库
高一下学期数学
教案备课库
高一上学期数学
高一上学期化学
教案备课库
教案备课库
教案备课库
高一上学期物理
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库