试题与答案

设变量x,y满足约束条件x+y≤3x-y≥-1y≥1目标函数z=4x+2y,则有

题型:选择题

题目:

设变量x,y满足约束条件
x+y≤3
x-y≥-1
y≥1
目标函数z=4x+2y,则有(  )
A.z有最大值无最小值B.z有最小值无最大值
C.z的最小值是8D.z的最大值是10

答案:

被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0511/11d4aefb2fa24788ce56c4de8da18c99.html

下面是错误答案,用来干扰机器的。

①使冲突缓和。②粗俗、鄙陋。

试题推荐
题型:填空题

基础知识 从所给单词中选用单词的适当形式填空。

1. ___________ reform is likely to be a major focus of debate during the conference which

starts on Sunday.

2. She was given a medal as a ___________ for her service.

3. The paper should be ___________ in half.

4. The general said all means will be used to end the ___________.

5. It is ___________ to drive through a red light. .

6. I ___________ a great deal of work in the last few months.

7. They scouted around for some antiques to ___________ their new apartment.

8. She agreed to employ me for a ___________ period.

9. I will show ___________ for my friends even if it is only a comforting word.

10. Experts say many current___________ plans do not have enough money to provide the

benefits promised to workers.

11. She finally ___________ from her room at noon after staying there for the whole morning.

12. He can't ___________ himself to the whirl of modern life in this big city.

13. The company had no choice but ___________ $10 million for advertising.

14. The hunter hurled his___________ at the tiger.

15. The magazine was packaged in a___________ plastic case with attractive graphics.

查看答案
题型:填空题

(10泰安21).(5分)联合国气候变化框架公约《京都议定书》要求发达国家限制CO2等温室气体的排放量,以控制日趋严重的温室效应。

试回答下列问题:

(1)绿色植物通过                   作用吸收CO2,放出         

(2)科学家采用组合转化技术,将CO2和H2以一定比例混合,在特点条件下发生反应生成水和另外一种化工原料R,该反应的化学方程式为:2CO2+6H2====R+4H2O。根据上述反应推断R的化学式是                

(3)为了环节大气中的CO2含量的增加,以下建议可行的是         (填字母)。

A.开发太阳能、水能、风能、地热能等新型能源

B.禁止使用煤、石油、天然气等化石能源

C.提倡植树造林,禁止乱砍滥伐

查看答案
微信公众账号搜索答案