已知关于x的方程x2-（3k+1）x+2k2+2k=0 （1）求证：无论k取何实

发布时间：2017-04-30 19:40 │ 来源：www.tikuol.com

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问题：

已知关于x的方程x²-（3k+1）x+2k²+2k=0

（1）求证：无论k取何实数值，方程总有实数根．

（2）若等腰△ABC的一边长为a=6，另两边长b，c恰好是这个方程的两个根，求此三角形的周长．

考点：一元二次方程根的判别式等腰三角形的性质，等腰三角形的判定

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补全对话。

— Any messages, Miss Smith?

— 1______

— Brown? 2______ What did he want?

— 3______ I told you'd phone him as soon as you got back..

— 4______ Er…you've got his telephone number, haven't you?

— Yes, it's six double three two O one five.

— Six double two three O one five.

— 5______

— Oh, you'd better write it down, Miss Smith. I'm bound to forget it.

— I have already done, Mr. Banks. It's on your desk.

A. No, six double three two O one five.

B. He wouldn't say. But it sounded important.

C. I can't call him now, I'm afraid.

D. I don't know anyone called Brown.

E. Well, I'd better do it then, I suppose.

F. Oh, he's my best friend, named William Brown.

G. Just one, Mr. Banks. You had a telephone call from someone called

Brown...David Brown.

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读中国地图，回答下列问题。（共18分）

（1）写出省级行政区A（全称）， F（简称） , G（行政中心）。

（2）写出山脉B ，河流C ，这是我国的地理分界线。

（3）写出邻国D 。

（4）图中虚线E是线，该线自西向东穿过的省级行政区是，，，（全称）

（5）写出我国的地形单元H 盆地，I 高原，J 盆地。

（6）全部位于热带的省级行政区K （全称）

（7）我国幅员辽阔、海陆兼备，陆地面积约为平方千米，居世界第位。

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对于股份有限公司申请股票在主板市场上市应当符合的条件，阐述错误的是( )。

A．股票经国务院证券监管管理机构核准已向社会公开发行

B．公开发行的股份达公司股份总数的25%以上；公司股本总额超过人民币4亿元的，公开发行股份的比例为10%以上

C．公司股本总额不少于人民币3000万元

D．公司在最近3年无重大违法行为，财务会计报告无虚假记载

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地黄（）

A．圆锥形或羊角状，表面灰黄色或棕褐色

B．不规则的团块或长圆形，表面灰黑或灰棕色

C．圆柱形，略弯曲，表面灰棕色至暗棕色，有节、芽、叶柄基和根痕

D．扁圆柱形，表面灰黄色，外皮横向断裂而露出木部，形似连珠

E．根茎粗短，下生根数条，表面棕红或暗棕红色

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In 1930, W. K. Kellogg made what he thought was a sensible decision, grounded in the best economic, social and management theories of the time. Workers at his cereal plant in Battle Greek, Mich. were told to go home two hours earlier, every day for good.
The Depression-era move was hailed in Factory and Industrial Management magazine as the "biggest piece of industrial news since Henry Ford announced his five-dollar-a-day policy." It’s believed that industry and machines would lead to workers’ paradises where all would have less work, more free time, and yet still produce enough to meet their needs.
So what happened Today, instead of working less, our hours have stayed steady or risen- and today many more women work so that families can afford the trappings of suburbia. In effect, workers chose the path of consumption over leisure.
With unemployment at a nine-year high and many workers worded about losing their jobs- or forced to accept cutbacks in pay and benefits -- work is hardly the paradise economists once envisioned.
The modern environment would seem alien to pre-industrial laborers. For centuries, the household -- from farms to "cottage" craftsmen -- was the unit of production. The whole family was part of the enterprise, be it farming, blacksmithing, or baking. "In pre-industrial society, work and family were practically the same thing," says Gillis.
The Industrial Revolution changed all that. Mills and massive iron smelters required ample labor and constant attendance. For the first time, work and family were split. Instead of selling what they produced, workers sold their time. With more people leaving farms to move to cities and factories, labor became a commodity and placed on the market like any other.
Innovation gave rise to an industrial process based on machinery and mass production. The theories of Frederick Taylor, a Philadelphia factory foreman, led to work being broken down into component parts, with each step timed to coldly quantify jobs that skilled craftsmen had worked a lifetime to learn. Workers resented Taylor and his stopwatch, complaining that his focus on process stripped their jobs of creativity and pride, making them irritable. Long before anyone knew what "stress" was, Taylor brought it to the workplace- and without sympathy.
The division of work into components that could be measured and easily taught reached its apex in Ford’s River Rouge Plant in Dearborn, Mich., where the assembly line came of age. To maximize the production lines, businesses needed long hours from their workers. But it was no easy to sell.
Labor leaders fought back with their own propaganda. For more than a century, a key struggle for the labor movement was reducing the amount of time workers had to spend on the job.
Between 1830 and 1930, work hours were cut nearly in half, with economist John Maynard Keynes famously predicting in 1930 that by 2030 a 15-hour workweek would be standard. While work had once been a means to serve God, two centuries of choices and industrialization had turned work into an end in itself, stripped of the spiritual meaning that sustained the Puritans who came ready to tame the wilderness.
By the end of the 1970s, companies were reaching out to spiritually drained workers by offering more engagement while withdrawing the promise of a job for life, as the American economy faced a stiff challenge from cheaper workers abroad. By the 1990s, technology made working from home possible for a growing number of people. Seen as a boon at first, telecommuting and the rapidly proliferating "electronic leash" of cell phones made work inescapable, as employees found themselves on call 24/7. Today, almost half of American workers use computers, cell phones, E-mail, and faxes for work during what is supposed to be nonwork time. Home is no longer a refuge but a cozier extension of the office.
When the stock market bubble burst and the economy fell into its recent recession, workers were forced to re-evaluate their priorities. They want a better quality of life; they’re asking for more flextime to spend with their families.
But there’s still the question of fulfillment. A recent study shows that work doesn’t satisfy workers’ deeper needs. "We expect more and more out of our jobs," says Hunnicutt. "We expect to find wonderful people and experience all around us."

The author ply believes that ______.

A．work is not all that people need though it is important.

B．work can offer people fulfillment

C．the economic recession can improve the people’s quality of life

D．the flextime can satisfy people’s needs.

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