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《钢铁是怎样炼成的》故事情节概括800字初中生作文 （M加3）的绝对值=（M减4）的绝对值,一个方程 (M加3)的绝对值=(M减24)的绝对值,一个方程 数列{an}中,a1=3,Nan+1-（n+1）an=2n·（n+1）1求证{an/n}为等差数列,冰球通项公式an.2设bn=（an-2n^2）·3^n,求数列{bn}的前n项和S. 已知根号十一减一的整数部分是a小数部分是b求根号十一加一的绝对值加b减1的绝对值的值 they didn't leave it was dark填 after,until,when,as 请问在设计行业,形容客户偏好的词语有哪些? Here ______ some good advice填is 还是areHere ______ some good advice填is 还是are,这种题是看some还是后面的不可数名词? Here are some advice这句话对吗 有什么语法问题啊是here is还是here are 英语太差了咋办 数列{an}满足an+1+(-1)^nan=2n-1,则{an}的前80项和为________. 万年牢这篇课文主要讲了什么/ 以教育局的工作思路为 用什么词语 here---some advice用is 还是 has拜托各位大神 名字的单词是? I have some advice for school,here areI have some advice for school,here are 这句话我这对了嘛?here are 求改正,我只是个初三的学生 下学期要高二了 ,想从暑假开始自学新概念英语二 .不知道应该配合什么参考书一起用?有查到凡本书不知道好用不?『WORKBOOK练习册』『练习洋解 』…「原配」『全新全译』『小题大作』…〔 Please be careful (not play ) with fire.空格填啥 I （）（tell） to be careful with fire every day 动词填空The detective has some evidence （）（prove） the suspect was at the scene of the crime.The Chinese people （）（struggle）bravely against the Japanese enemies for our motherlan 英语作文:向外国人介绍如何学习汉语 高二的英语哪种语法书更好 人教版高二买什么英语语法书好. They were too busy.They said nothing.(合并为一句）They were _____ busy _____ say nothing. 读后感(800字）抄的不给分, No matter what happens I will stand by the road中文是什么意思 No matter what happens I will stand by you so do not be afraid 数学数列与对数结合的不等式已知m n k为正自然数,m0,a1>1,求证logAn(An+1)>logAn+1(An+2) What is the current procedure,to participate with our Quotation in this project? 急需Giving a helping hand as a volunteer的英文文章 大学英语演讲稿 关于volunteerhate you ever thought about doing volunteer?不要写奥运志愿者,要与时俱进,可以写点关于expo 前两题有答案就ok了 和田的维吾尔 主要内容（简洁点的）