题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017062323-52828.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017062323-53083.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017062323-11283.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017062323-86867.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017062324-26028.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017062324-87876.png)
解析
试题分析:根据题意,由于实数
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017062323-52828.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017062323-53083.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017062323-11283.png)
,那么作出不等式表示的区域,可知表示的区域为无界区域,端点坐标
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017062324-11852.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017062324-60958.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017062324-60958.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017062325-97956.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017062324-87876.png)
点评:解决该试题的关键是利用不等式表示的区域,结合目标函数的斜率来平移法得到过点的时候,只要截距最小时的那个点即为最优解。属于基础题。
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017062319-91673.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017062319-73772.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017062320-81733.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017062319-73772.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017062320-35370.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017062320-85548.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017062311-65057.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017062311-98574.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017062312-84224.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017062307-77431.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017062308-66220.png)
A.![]() | B.![]() | C.![]() | D.4 |
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017062300-67533.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017062300-35172.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017062301-34815.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017062301-55478.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017062301-11421.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017062256-45033.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017062256-32321.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017062256-86949.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017062257-49322.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017062257-92174.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017062257-38906.png)
最新试题
- 1(14分)工业上利用CO和水蒸气在一定条件下发生反应制取氢气:CO(g)+H2O(g) CO2(g)+H2(g)
- 2如图所示,在斜三棱柱ABC-A1B1C1中,∠A1AC=∠ACB=π2,∠AA1C=π6,侧棱BB1与底面所成的角为π3
- 3下列句子中的成语使用有误的一项是A.篆刻欲运刀随心所欲,各逞其妙,需讲究刀法。B.对于公益事业,他甘之如饴;对于奢侈享受
- 4某校为了解九年级男生1000米长跑的成绩,从中随机抽取了50名男生进行测试,根据测试评分标准,将他们的得分进行统计后分为
- 5如下图所示,其中属于晶体凝固图象的是[ ]A.B.C.D.
- 6Ann,a mother of 3 children, is a warm-hearted social worker
- 7不定项选择一个用满偏电流为3mA的电流表改装成欧姆表,调零后用它测500Ω的标准电阻时,指针恰好指在刻度盘的正中间,如用
- 8函数的图象大致是[ ]A.B.C.D.
- 9下列现象能说明生物对环境有影响的是( )A.到了秋天树木纷纷落叶B.生长在河堤上或塘边的柳树能防水固堤C.旗形树的树冠
- 10Every year, on the International Volunteers Day, the world t
热门考点
- 1下列各项中没有错别字的一项是A.膨涨噩梦山岫鲲鹏B.晦朔孤鹜厢房蓬篙C.盘桓赍发拔濯怅然D.粽子遄飞命舛炼字
- 2发展先进文化的中心环节是[ ]A、坚持以马列主义为统领B、培育四有新人C、牢牢把握先进文化的前进方向D、加强社会
- 3为了比较水和煤油的吸热能力,小王做了如下图10所示的实验,在2个相同的烧杯中分别装有质量、初温都相同的水和煤油,用两个相
- 4已知下列六个关系式:(1)a∉{a};(2)∅⊊{a};(3){a}∈{a,b,c};(4){a}⊆{a};(5)∅∈{
- 5受______位置和______位置的影响,我国大多数地区形成了典型的季风气候.
- 6如图所示,高为h的光滑斜面固定在水平地面上.一质量为m的小物块,从斜面顶端A由静止开始下滑.已知重力加速度为g,若不计空
- 7----May I ______your Chinese-Russian dictionary? ----Sorry,
- 8AB=AC,AD是△ABC的中线,则∠B与∠C相等吗?∠1与∠2相等吗?说明你的理由。
- 9如图,O为直线AE上一点,OC平分∠BOD,∠1+∠2=90°,∠2=44°,求∠AOC的度数.
- 10—Are you going to Dalian by air?—No, the tickets are ____exp