第几年起,上海全市初一至初三年级的少先队员换戴上了大号红领巾?

一甲子六十年,今年是当中的第28辛卯年.

在岛上第24年星期五那一天救了一个野人,取名为"星期五".

首先,同学你说的是初高中的有的,按你写的先后顺序来看——中国古代史是初一上下册（不列入中考范围）； 中国近代史是初二上下册； 世界近代史是初三上下册.按高中课本顺序来看——中国近代史是高一上下册（会考范围); 世界近代史是高二上下册； 中国古代史是高三全一册.只不过是初中比高中知识浅些,高中内容比初中多些、深些而已.如果你们追进度的话就不保证是不是在每个特定学年学了.不过初中应该比较稳定,高中补课可能性更大.你可以到中学教育网去查下教科书封面和内容什么的.O(∩_∩)O~呵呵,OK了吗?

第二年四倍母体上.（第一年的二倍体西瓜——在结果时用秋水仙素加倍成四倍体——第二年用普通二倍体西瓜花粉受精——其果实为三倍体）

《伊利亚特》叙述了特洛伊战争第十年（也是最后一年）中几个星期的活动

如果是 “第二年”,倒是有几种表示法：


the second year 第二年
the next year 下一年
the ensuing year/ the year ensuing 次年
the following year/ the year following 跟着的一年
the coming year 跟着来的一年


但是要说 “第某年”,就只能局限在 “the + 序数词 + year” 这一种办法,如：


the third year 第三年
the 100th year 第100年


不过还可以用绕道的办法表示,如表示 “第三年”：


the ensuing year of the second 第二年的次年）
the next year of the second 第二年的下一年
the following year of the second 第二年接下来的那年
the coming year of the second 第二年跟着的来的一年

今年是第0年，不考虑折现
第一种方案：第n年一共多加的钱f(n)=12*1000*n=12000n，
n年多加的钱F(n)=f(0)+f(1)+...+f(n)=n(n+1)/2*12000=6000n(n+1)=6000*n^2+6000n
第二种方案：第n年多加的钱g(n)=12*(300+300)*n+6*300=7200n+1800,
n年一共多加的钱G(n)=g(0)+g(1)+...+g(n)=3600n(n+1)+1800(n+1)=3600*n^2+5400n+1800
n年第一种方案比第二种方案多加的钱 F(n)-G(n)=2400*n^2+600*n=1800
解这个方程即可
第3个问题把g(n)中的300改成a计算即可

1.50x-{98+【12x+x(x-1)4/2】}＞ 0
10-51的0.5次方
2.这个问题好像要化成函数曲线,
当第10年的时候,年平均获利最大,此时获利29.5万
纯收入获利最大时,获利51万,
29.5+26＜51+8
所以第二种方案合算.

This year is how many years we know,这又不是多么高级的句子,你那么写就可以呀

2001年是21世纪的第一年,现在是第7年

18
1990.6.26开始的

Thomas Edison's greatest challenge was the development of a practical incandescent,electric light.Contrary to popular belief,he didn't "invent" the lightbulb,but rather he improved upon a 50-year-old idea.In 1879,using lower current electricity,a small carbonized filament,and an improved vacuum inside the globe,he was able to produce a reliable,long-lasting source of light.The idea of electric lighting was not new,and a number of people had worked on,and even developed forms of electric lighting.But up to that time,nothing had been developed that was remotely practical for home use.Edison's eventual achievement was inventing not just an incandescent electric light,but also an electric lighting system that contained all the elements necessary to make the incandescent light practical,safe,and economical.After one and a half years of work,success was achieved when an incandescent lamp with a filament of carbonized sewing thread burned for thirteen and a half hours.
There are a couple of other interesting things about the invention of the light bulb:While most of the attention was on the discovery of the right kind of filament that would work,Edison actually had to invent a total of seven system elements that were critical to the practical application of electric lights as an alternative to the gas lights that were prevalent in that day.
These were the development of:
the parallel circuit,
a durable light bulb,
an improved dynamo,
the underground conductor network,
the devices for maintaining constant voltage,
safety fuses and insulating materials,and
light sockets with on-off switches.
Before Edison could make his millions,every one of these elements had to be invented and then,through careful trial and error,developed into practical,reproducible components.The first public demonstration of the Thomas Edison's incandescent lighting system was in December 1879,when the Menlo Park laboratory complex was electrically lighted.Edison spent the next several years creating the electric industry.
The modern electric utility industry began in the 1880s.It evolved from gas and electric carbon-arc commercial and street lighting systems.On September 4,1882,the first commercial power station,located on Pearl Street in lower Manhattan,went into operation providing light and electricity power to customers in a one square mile area; the electric age had begun.Thomas Edison's Pearl Street electricity generating station introduced four key elements of a modern electric utility system.It featured reliable central generation,efficient distribution,a successful end use (in 1882,the light bulb),and a competitive price.A model of efficiency for its time,Pearl Street used one-third the fuel of its predecessors,burning about 10 pounds of coal per kilowatt hour,a "heat rate" equivalent of about 138,000 Btu per kilowatt hour.Initially the Pearl Street utility served 59 customers for about 24 cents per kilowatt hour.In the late 1880s,power demand for electric motors brought the industry from mainly nighttime lighting to 24-hour service and dramatically raised electricity demand for transportation and industry needs.By the end of the 1880s,small central stations dotted many U.S.cities; each was limited to a few blocks area because of transmission inefficiencies of direct current (dc).
The success of his electric light brought Thomas Edison to new heights of fame and wealth,as electricity spread around the world.His various electric companies continued to grow until in 1889 they were brought together to form Edison General Electric.Despite the use of Edison in the company title however,he never controlled this company.The tremendous amount of capital needed to develop the incandescent lighting industry had necessitated the involvement of investment bankers such as J.P.Morgan.When Edison General Electric merged with its leading competitor Thompson-Houston in 1892,Edison was dropped from the name,and the company became simply General Electric.

公元前202年出生.

99.12.20回归.明天就是11年了.

18世纪