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求助,请问这个方程组怎么解?谢谢您了。一定要正确答案啊!需要有解题过程。_百度知道
求助,请问这个方程组怎么解?谢谢您了。一定要正确答案啊!需要有解题过程。
助。花括号是一个,请问大哥大姐们,只能用小的代替了,原题是这3个方程都在一个大花括号内了,这个方程组怎么解。不能直接写答案,这些方程都在一个花括号内了,可惜小弟我不会打最大的那个花括号?需要有解题过程+结果
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(2)-(1)得 2x1-2x2=2 ,(2)+(3)得 4x1-4x3=4 ,所以方程的解是 {x1=k(自由的){x2=k-1{x3=k-1{x4=6k-7
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其他3条回答
(2)-(1)得 2x1-2x2=2 ,(2)+(3)得 4x1-4x3=4 ,所以方程的解是 {x1=k(自由的){x2=k-1{x3=k-1{x4=6k-7
在线性代数里用矩阵的方法可解得x2=0
则 x4=4a-1
方程组的增广矩阵用行初等变换:
(x1,x2,x3,x4)^T= c(1,-2,1,0)^T +d(0,1/2,0,1)^T + (1,1/2,0,0)^T
c,d为任意常数。 这是很规范的解答了。
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有问题?让千万网友来帮您回答!英语考试求救!!谢谢你们啊。。。。_百度知道
英语考试求救!!谢谢你们啊。。。。
Advertising (广告) can be thought of &as the means of making something known in order to buy or sell goods or services&. Advertising aims to increase people&#39;s awareness and arouse interest. It tries to inform and to persuade. The media are all used to spread the message, and the press offers a fairly cheap method. Magazines are used to reach special sections of the market. The cinema and commercial radio are useful for local markets. Television, although more expensive can be very effective. Posters (海报) are fairly cheap and more permanent (永久地) in their power of attraction. Other ways of increasing consumer (消费者) interest are through exhibitions and trade fairs as well as direct mail advertising. We might ask whether the cost of advertising is paid by the producer or by the consumer. Since advertising forms part of the cost of production, which has to be covered by the selling price, it is clear that it is the customer who pays for advertising. However, if large-scale advertising leads to increased demand, production costs are reduced, and the customer pays less. It is difficult to measure the influence of advertising on sales exactly. When the market is growing, advertising helps to increase demand. When the market is shrinking (变小), advertising may prevent a bigger fall in scales than would occur without its support. What is clear is that businesses would not pay large sums for advertising if they were not convinced of its value to them. 6.
The purpose of advertisements is to warn.
Advertising makes use of mass media.
When the increased 俯丁碘股鄢噶碉拴冬茎demand for the commodity (商品) has cut production expenses, the cost of the advertisement is paid by the salesman.
The businessmen will not put money in the advertisement if it is not worthwhile to do so.
The best title for the passage is Consumers and Advertisements.
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出门在外也不愁英文“ 谢谢您的参与 ”英语怎么说?
在沪江关注能力英语的沪友benjulia遇到了一个关于小D词条求助的疑惑,已有4人提出了自己的看法。
知识点疑惑描述:
英文“ 谢谢您的参与 ”英语怎么说?
最佳知识点讲解
知识点相关讲解
Thank you for your participation!
—— llx6629
Thank you for your corporation.
—— aa_maggie
Thank you for your attention.
Thank you for your joining!/participation!
—— 假兔子
相关其他知识点
CopyRight & 沪江网 2015&&& 查看话题
修改稿回复问题!求助大家,真诚感谢您!
审稿人让我修改英语,我做了很多修改,小的或者大的修改,我需要按照下面的格式一一列举出来吗?
1.& && &&&Page 1, paragraph 1, the first sentence “Although there have been extensive investigations about the axisymmetric oscillation of free drops, few attempts were made about the more difficult case of non-axisymmetric oscillation.” is deleted.
2.& && &&&Page 1, paragraph 1, the second sentence “Here we report the excitation of the sectorial oscillation of water drops with acoustic levitation and active modulation method.” is modified to “We report experiments in which the non-axisymmetric sectorial oscillations of water drops have been excited using acoustic levitation and an active modulation method.”
3.& && &&&Page 1, paragraph 1, the last sentence “The frequency of sectorial oscillation for the oblate drop is found to depend strongly on its equatorial radius and can be formulated by a modified expression of Rayleigh equation.” is modified to “The data can be well described by a modified Rayleigh equation, without the use of additional parameters.”
4.& && &&&Page 4, paragraph 2, the first sentence, “less than 10 Hz wide” is added at the end of the sentence.
。。。。。。。。。。。。。。。。。。
换了词或者换了句子
最好对审稿人的意见一条一条的回答,在什么地方,做了什么修改。不要怕麻烦,这样可以让审稿人清楚地知道你对他的意见做的什么修改。我曾经的一篇文章回复写了两页多。
英语最好找个人帮你看看,他提出来了,估计确实有需要改进的。英语非我们的母语,老外经常挑我们的语言毛病。他们也许不是故意的,而是表达习惯。 看杂志要求吧 有些杂志只要求用word上的修订模式标注即可 有些要逐条写出来
我觉得楼上的意见是对的 修改之处一一标明总没有问题 修改过的用不同颜色标出,response letter 中说明就可以了 1.修改过的用不同颜色标出就可以了,不然编辑&审稿人烦死了
2.提出的问题要依次回答 如果大范围重写,只要说明一句就行了没必要处处标出,但是针对编辑和审稿提出的问题要逐一回答,并最好指出在文中何处进行了相应的修改! 没有必要像你这样都标出来,太多了人家也烦,但一定要请人改好,最好是母语是英语的老外,再不就是到英美待过的老师。改好后在cover letter里说一下你已经请什么什么人帮你进行了修改就Ok了,祝好运 你就安装审稿人提出的问题一一的给出答复,态度要端正、语气要谦虚,给他一种虚心好学的样子:P让他觉得心里很舒服,看到孺子可教:D:D,主编心里高兴,然后很快就说你的大作接受了,岂不两全其美?:tiger38: 逐条回答,修改的地方黄色背景标出,不要怕Reply to reviewer比文章长。 建议楼主根据审稿人的意见逐条回答,不要怕麻烦,越详细,越清楚,就越好。 应该是把文章中修改的地方突出显示就好了吧,在cover letter 里面说一下 认真再改一下吧:) 学术问题逐条回答,语言问题不用,说明白仔细修改就好了 如果不超过10处,可以一一说明,如果很多,在修改稿中用统一的颜色标记 把主要的修改列出来就好,一些语法方面的可一笔带过,其他问题要详细列出,祝楼主好运!! 建议楼主根据审稿人的意见逐条回答,不要怕麻烦,越详细,越清楚,就越好。
文章中以另一种颜色或字体标出 我回复的时候,没有在文章中标出修改过的地方。:(现在看了大家的留言有点后悔自己的粗心了 Originally posted by weiyusen at
没有必要像你这样都标出来,太多了人家也烦,但一定要请人改好,最好是母语是英语的老外,再不就是到英美待过的老师。改好后在cover letter里说一下你已经请什么什么人帮你进行了修改就Ok了,祝好运 同样,cover letter里还要说明一下吗?怕麻烦人家老师,就这样了,我照文献里的句子写得。 语句的改动没必要,写一条就可以了,说明你改动的地方都用红色标出来了 尽量写清楚,方便审稿人
与人方便与己方便
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