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求解下列线性规划问题： (1)max z=x 1 +2x 2 , s．t．2x 1 +x 2 ≤8， -x 1 +x 2 ≤4， x 1 -x 2 ≤0， 0≤x 1 ≤3，x 2 ≥0； (2)min f=-3x 1 -11x 2 -9x 3 +x 4 +29x 5 ， s．t．x 2 +x 3 +x 4 -2x 5 ≤4， x 1 -x 2 +x 3 +2x 4 +x 5 ≥0， x 1 +x 2 +x 3 -3x 5 ≤1， x 1 无符号限制，x i ≥0(j=2，3，4，5)； (3)max x=x 1 +6x 2 +4x 3 , s．t．-x 1 +2x 2 +2x 3 ≤13， 4x 1 -4x 2 +x 3 ≤20， x 1 +2x 2 +x 3 ≤17， x 1 ≥1，x 2 ≥2，x 3 ≥3．
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参考答案：
举一反三
【多选题】网络广告的优势有哪些?
A.
覆盖面广传播范围广
B.
方式灵活互动性强
C.
针对性较差
D.
可以准确的统计受众数量
E.
拉长了媒体投放的进程
查看完整题目与答案
【单选题】一 you your dictionary? —No. So I have to buy a new one today.
A.
Did; find
B.
Have; found
C.
Are; finding
D.
Had; found
查看完整题目与答案
【多选题】成家立业后会面临哪三大人生重任
A.
结婚生子
B.
子女教育
C.
父母赡养
D.
自己退休
查看完整题目与答案
【单选题】I have lost my dictionary. I have to buy a new _______.
A.
it
B.
that
C.
one
D.
this
查看完整题目与答案
【单选题】I have lost my pen. I can’t find_____. I have to buy____.
A.
it, it
B.
it, one
C.
one, it
查看完整题目与答案
【单选题】用并列连词连接句子 I have to buy a washing machine. My arthritis has become very painful.
A.
I have to buy a washing machine and my arthritis has become very painful.
B.
I have to buy a washing machine but my arthritis has become very painful.
C.
I have to buy a washing machine for my arthritis has become very painful.
D.
I have to buy a washing machine so my arthritis has become very painful.
查看完整题目与答案
【多选题】成家立业后会面临( )三大人生重任。
A.
、结婚生子
B.
、子女教育
C.
、父母赡养
D.
、自己退休
查看完整题目与答案
【多选题】网络广告的优势有哪些
A.
互动性强
B.
突破时空限制
C.
传播精准
D.
成本低
E.
效果可监测
查看完整题目与答案
【多选题】成家立业后会面临( )三大人生重任
A.
结婚生子
B.
子女教育
C.
父母赡养
D.
自己退休
查看完整题目与答案
【单选题】—Kate, why do you want to go to the _______? —I have to buy a new Walkman. [     ]
A.
bookshop
B.
shoe shop
C.
electrical shop
D.
clothes shop
查看完整题目与答案
相关题目：
【多选题】网络广告的优势有哪些?
A.
覆盖面广传播范围广
B.
方式灵活互动性强
C.
针对性较差
D.
可以准确的统计受众数量
E.
拉长了媒体投放的进程
查看完整题目与答案
【单选题】一 you your dictionary? —No. So I have to buy a new one today.
A.
Did; find
B.
Have; found
C.
Are; finding
D.
Had; found
查看完整题目与答案
【多选题】成家立业后会面临哪三大人生重任
A.
结婚生子
B.
子女教育
C.
父母赡养
D.
自己退休
查看完整题目与答案
【单选题】I have lost my dictionary. I have to buy a new _______.
A.
it
B.
that
C.
one
D.
this
查看完整题目与答案
【单选题】I have lost my pen. I can’t find_____. I have to buy____.
A.
it, it
B.
it, one
C.
one, it
查看完整题目与答案
【单选题】用并列连词连接句子 I have to buy a washing machine. My arthritis has become very painful.
A.
I have to buy a washing machine and my arthritis has become very painful.
B.
I have to buy a washing machine but my arthritis has become very painful.
C.
I have to buy a washing machine for my arthritis has become very painful.
D.
I have to buy a washing machine so my arthritis has become very painful.
查看完整题目与答案
【多选题】成家立业后会面临( )三大人生重任。
A.
、结婚生子
B.
、子女教育
C.
、父母赡养
D.
、自己退休
查看完整题目与答案
【多选题】网络广告的优势有哪些
A.
互动性强
B.
突破时空限制
C.
传播精准
D.
成本低
E.
效果可监测
查看完整题目与答案
【多选题】成家立业后会面临( )三大人生重任
A.
结婚生子
B.
子女教育
C.
父母赡养
D.
自己退休
查看完整题目与答案
【单选题】—Kate, why do you want to go to the _______? —I have to buy a new Walkman. [     ]
A.
bookshop
B.
shoe shop
C.
electrical shop
D.
clothes shop
查看完整题目与答案
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