题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017063058-41696.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017063058-73621.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017063058-99901.png)
A.![]() | B.![]() | C.![]() | D.![]() |
答案
解析
试题分析: 因为根据题意,点
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017063058-41696.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017063058-73621.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017063058-16869.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017063059-69920.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017063059-80380.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017063059-26398.png)
作出可行域,分析可得:
点(a,b)与点(-3,-2)确定的直线的
斜率为[
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017063059-56828.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017063100-39544.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017063058-18554.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017063058-40432.png)
则
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017063058-16869.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017063058-40432.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017063100-79040.png)
点评:解决该试题的关键是画出可行域,将目标函数变形,赋予几何意义,是可行域中的点与点(-3,-2)连线的斜率的2倍加上4,由图求出取值范围。
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017063050-98785.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017063050-98084.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017063051-61282.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017063051-45403.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017063046-22702.png)
A.![]() | B.![]() | C.![]() | D.![]() ![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017063041-65214.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017063041-75164.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017063041-63906.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017063042-18518.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017063042-76878.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017063042-16068.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017063042-90884.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017063036-17402.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017063036-29253.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017063037-45399.png)
A.![]() | B.6 | C.7 | D.10 |
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017063031-98711.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017063031-98711.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017063031-98711.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017063031-98711.png)
最新试题
- 1-2的绝对值是 ,相反数是 。
- 2下列划线的成语使用错误的一项是( )(2分)A.唐雎这种凛然不可侵犯的独立人格和自强的精神,在历史的长河中一直熠
- 3 This book doesn’t belong to _____. It is so interesting th
- 4(1)求值:6413-(-23)0+3125+lg2+lg50+21+log23;(2)求值:tan80°-tan20°
- 5(2011安徽,15,8分)先化简,再求值:,其中x=-2.
- 6(本小题满分12分)过曲线上的一点作曲线的切线,交轴于点;过作垂直于轴的直线交曲线于,过作曲线的切线,交轴于点;过作垂直
- 7植株生长需要的营养有______、______和______,它们分别是通过植物的______和______获得的.
- 8He saw a boy _____ on the truck when he got off the train. [
- 9下列对德、意、日建立法西斯专政的表述,正确的是[ ]A.都是在1929—1933年经济危机打击下,建立法西斯专政
- 10要增加财政收入,就必须[ ]①减少企业和个人的收入②努力发展经济,增强国家的综合经济实力 ③努力搞好税收工作 ④扩
热门考点
- 1中国人民银行积极运用信贷杠杆促进经济结构调整,克服“大而全、小而全”和盲目重复建设,开展了卓有成效的工作。在农业方面,制
- 2_________ a sports meeting in our school this Friday afterno
- 3在世界经济现代化历程中,钢铁发挥了重要作用。阅读下列材料,回答问题:材料一:1740年英国的生铁产量为1.7万吨, 18
- 4.(本小题满分10分)已知不等式的解集为(1)求、的值;(2)若函数在区间上递增,求关于的不等式的解集。
- 5填写单词。 1. His books have _______ the lives of millions of peo
- 6世界海陆的分布特点是( )A.陆地全部集中在北半球B.地球表面陆地面积比海洋面积大C.南极地区是海洋,北极地区是陆地D
- 7下列四幅图中能正确描绘点电荷电场中电场线的是( )
- 8的算术平方根是[ ]A.3B.C.±3D.±
- 9如图,△DAC和△EBC均是等边三角形,AE、BD分别与CD、CE交于点M、N,有如下结论:①△ACE≌△DCB;②CM
- 10She likes to have everything in order so that she can ______