1000,-2500,+500-1000这些数有什么特点?这些书在数轴上又怎么分布的,有何特点?

第1篇
EVEN by the standards of the worst financial crisis for at least a generation, the events of Sunday Spetember14th and the day before were extraordinary. The weekend began with hopes that a deal could be struck, with or without government backing, to save Lehman Brothers, America’s fourth-largest investment bank. It ended with Lehman’s set for Chapter 11 bankruptcy protection and the bank preparing to wind itself up after those efforts failed. Other vulnerable financial giants scrambled to sell themselves or raise enough capital to stave off a similar fate. Merrill Lynch, the third-biggest investment bank, sold itself to Bank of America (BofA), an erstwhile Lehman suitor, in a $50 billion all-stock deal. American International Group (AIG) brought forward a potentially life-saving overhaul and went cap-in-hand to the Federal Reserve.

On Sunday night the situation was still fluid, with bankers and regulators working to limit the fallout. They were girding themselves for a dreadful Monday in the markets. Australia’s stockmarket opened sharply lower on Monday (most other Asian bourses were closed). American stock futures were deep in the red too, and the dollar weaker. Spreads on risky credit, already elevated, widened further.
第2篇
The effect of the global financial
The international financial crisis is becoming more and more worse, the impact on the Chinese economy is also further expansion, it even extended into every aspect of society.For example, manufacturing, energy, food, IT… and so on..
From the news,many international companies went bankrupt,and more companies begin to lay off employees, also cancelled the original recruitment plan. Around us, many people can not find a job.
This is a global economic crisis, no one can disregard .Facing the crisis, We can only helpless?No way. Everything has two sides. The financial crisis also let investors concer about the long-term growth prospects field. For example, the field of new energy. It also provides China opportunities of increasing the input of new energy.
We will use their wisdom, potential, and find the way to overcome it. This is the only way to minimize crisis, also can be safely in this crisis.
我刚刚自己写的,希望对你有用.

以下是影评
:The story may sound simple,but the truth behind the words is remarkable.When I heard the name of the film first time,I considered the Shawshank to be a man’ name,but in face it is a jail——a hell in the world.Not only for the inhumanity of the jailors——they behaved brutally; but also for the jail gnawed at people’ heart by keeping them waiting and waiting as life passed.It seemed that only those utterly worthless people who gave up everything could survive.That’s where the story happened.
The part impressed me most is when Andy got out of the jai.He extended his arms in front of him in the heavy rain as if he were welcoming the fresh air and the freedom.At that moment,I saw the faith win the darkness,discharging light dazzling the eyes in the dark blue sky.Under the light,I could feel my recreant innermost being shivering as his voice said:“Remember,Hope is a good thing,maybe the best of things and no good thing ever dies!”
That’s why I like this film:it encourages people to fight to preserve the dignity of human beings,to appreciate the beauty of life,and the most important is to keep hope forever.He once that is born,that is die.Everyone is the same.The only difference is whether busy living or busy dying.The film tells me even a man can live once,but if he keeps faith,keeps hope and works his life right,then once is enough.The faith is the bird that feels the light when the dawn is still dark,the hope is the chief happiness that this world affords,and the life should be full of the singing of the bird and the happiness hope brings." What’s that do you think?It’s the trembling of the heart,the singing of the mind,the flying of the soul and the hope to be free.”

用万用表测三极管
我们一般可以容易找到基极b,但另外两个电极哪个是集电极c,哪个是发射极e呢?这时我们可以用测穿透电流ICEO的方法确定集电极c和发射极e.
(1) 对于NPN型三极管,用手指捏住b极与假设的c极,管脚间利用我们的手指充当电阻的作用,用黑表笔接假设的c极,红表笔接假设的e极,万用表打到*1K档测量两极间的电阻Rce；之后将假设的c ,e 极对调再测一次.虽然两次测量中万用表指针偏转角度都很小,但仔细观察,总会有一次偏转角度稍大,此时电流的流向一定是：黑表笔→c极→b极→e极→红表笔,所以此时黑表笔所接的一定是集电极c,红表笔所接的一定是发射极e.
(2) 对于PNP型的三极管,道理也类似于NPN型,其电流流向一定是：黑表笔→e极→b极→c极→红表笔,其电流流向也与三极管符号中的箭头方向一致,所以此时黑表笔所接的一定是发射极e,红表笔所接的一定是集电极c.
下面再介绍一下如何用万用表判定一个三极管是高频管还是低频管.
首先用万用表测量三极管发射极的反向电阻,如果是测量PNP型管,万用表的负端接基极,正端接发射极；如果是测量NPN型管,万用表的正端接基极,负端接发射极.然后用万用表的R*1KΩ挡测量,此时万用表的表针指示的阻值应当很大,一般不超过满刻度值的1/10.再将万用表转换到R*10KΩ挡,如果表针指示的阻值变化很大,超过满刻度值的1/3,则此管为高频管；反之,如果万用表转换到R*10KΩ挡后,表针指示的阻值变化不大,不超过满刻度值的1/3,则所测的管子为低频管.

500×95%×6+1000×85%×6+（x-500-1000）75%×6
= 3000×95%+6000×85%+（x-1500）75%×6
= 30×95+60×85+（x-1500）75%×6
= 2850+5100+75%x-9000
= 2850+5100+75%x-9000
=75%x-1050

第一题题目有问题 需求函数为Qd=500-1000p 这个需求函数在P=2,4的时候Qd

100-1000+500-1000+1000-4000+10000
=(100+500)+(-1000+1000)+(-1000-4000)+10000
=600+(-5000+10000)
=600+5000
=5600

是和水的比例,比如1g磷酸二氢钾兑500g水或者1g兑1000g水,500g水和1000g水就是500ml和1000ml水