问题 解答题

某公司租赁甲、乙两种设备生产A,B两类产品,甲种设备每天能生产A类产品5件和B类产品10件,乙种设备每天能生产A类产品6件和B类产品20件.已知设备甲每天的租赁费为200元,设备乙每天的租赁费为300元,现该公司至少要生产A类产品50件,B类产品140件,求所需租赁费最少为多少元?

答案

设甲种设备需要生产x天,乙种设备需要生产y天,该公司所需租赁费为z元,则z=200x+300y,(2分)

甲、乙两种设备生产A,B两类产品的情况为下表所示:

产品

设备

A类产品

(件)(≥50)

B类产品

(件)(≥140)

租赁费

(元)

甲设备510200
乙设备620300
(4分)

则满足的关系为

5x+6y≥50
10x+20y≥140
x≥0,y≥0
即:
x+
6
5
y≥10
x+2y≥14
x≥0,y≥0
,(6分)

作出不等式表示的平面区域,

当z=200x+300y对应的直线过两直线

x+
6
5
y=10
x+2y=14
的交点(4,5)时,

目标函数z=200x+300y取得最低为2300元.(12分)

单项选择题
单项选择题

Judge Kleinberg got it right when he made it clear that there weren’t separate rules for bloggers and journalists.

That’s not to say bloggers are or aren’t journalists—just that there shouldn’t be a distinction. In other words, the same rules apply to everyone. But—and here’s the tricky part—although the rules apply to people equally, we can, do, and should apply them differently to different acts. Asking whether bloggers are journalists is meaningless. What’s important isn’t the person but the product. If a snoopy 12-year-old girl find evidence that her town’s mayor is taking bribes, then collects it, verifies it, and publishes it on her blog, that’s journalism. If Waiter Cronkite writes in his diary that he planted daisies and washed the dishes that afternoon, that’s not. It’s what’s done, not who’s doing it.

This isn’t something that always needed to be pointed out. In the old days, you could draw a line between journalists and everyone else, just as you could draw a line between any other profession. What you did is what you were: reporter, barber, grocer, tailor, whatever. Journalists were usually hired by newspapers, magazines and radio stations. And they followed certain rules, respecting off-the-record comments, being accurate and not misquoting.

Today, the Web is an essentially way to get news, and, while journalism is pretty much the same, the term "journalist" is getting a bit cloudy. That’s why the question of whether bloggers are journalists keeps coming up. When anyone can publish, anyone can be a journalist. So the questions the courts need to answer is not, "Who is a journalist" but rather, "Who is doing journalism" That 12-year-old girl was doing it, even if she isn’t in high school yet—even if she wasn’t a journalist.

Not being a journalist doesn’t necessarily reduce the quality of the work, nor should it reduce the protections it receives. So when a question of journalists’ rights comes up, we need to ask two questions. First, "What protections should journalism receive under the First Amendment" And second, "Was the person in question performing an act of journalism" If she is—if the work she was doing involves gathering and publishing information of legitimate public interest—then her profession doesn’t matter.

The idea that the line between amateurs and professionals is blurring is something we need to get used to. The Web gives the little guy the same publishing tools as the big guy. Video-editing software is inexpensive enough that the quality of amateurs equals that of many pros. But while our technology is removing age-old distinctions, our perceptions and our laws haven’t quite embraced the new reality. It’s time to shift our thinking.

People continue debating the status of the bloggers because()

A. the bloggers get no pay for publishing anything online

B. the bloggers throw up too many sensational news stories

C. no proper laws have been made to protect the bloggers

D. people’s idea about what a journalist is is changing