人教版英语必修一第五单元

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怎么写离子的符号,有什么规律吗? 书写离子符号. 国外离子符号的写法我有一道SAT2的化学题,其中铝离子写成Al+3(+3上标).国外离子符号就是这样写吗?是“+3”还是“3+”.是不是只有中国写成“3+”?如果我要写英文的化学论文,离子符号该怎 先观察下面各式,算一算你能发现什么规律?请你照样子写出几道算式,并算一算9/2+9/7 9/2× 9/7 11/6+11/5 11/6 ×11/5 8/3+8/5 8/3×8/5 第二题,巧算.3/2×4/3×5/4×.×101/100×102/101 观察下列算式,通过观察,写出满足上述各式规律的一般公式 请你认真观察下面各个式子,然后根据你发现的规律写出第4,5个式子√16=√1x16=√1x4²=√1x√4²=1x4=42.√32=√2x16=√2x4²=√2x√4²=√2x4=4√23.√48=√3x16=√3x4²=√3x√4²=√3x4=4√3 该怎么判断简便计算,该用的运算定律? 如何选择运算定律简便计算 (简便计算,用运算定律) 用字母表示数当 | X |+2008 = | X-2008 |X的取值范围是多少 有关初一数学用字母表示数的题目,要有一定难度的!最好是试卷上的附加题! 一道关于数学规律的题在数列1/2,2/3,3/4,4/5.里,第100个数是什么这列数的前100个数的乘积是多少要有算式 求一道数学规律题 根据规律计算观察下列各式:-1*1/2=-1+1/2:;-1/2*1/3=-1/2+1/3;-1/3*1/4=-1/3+1/4用你发现的规律计算:(-1*1/2)+(-1/2*1/3)+(-1/3*1/4)+……+(-1/2009*1/2010) 先找规律然后再按规律计算:1/2+1/4=3/4 1/2+1/4+1/8=7/81/2+1/4+1/8+1/16=15/161/2+1/4+1/8+1/16+1/32=31/321/2+1/4+1/8+1/16+1/32+1/64+1/128+1/256=? 按上述规律计算 用去括号法计算 a+b是什么运算法则 小学加法法则与有理数加法法则的区别与联系,清说详细一些 有理数的定律公式...(急)例:A-B=A+(-B) 有理数加法法则几个字概括 初一有理数加法法则 根据汉语及首字母写出单词,使句子意思完整正确.Doing e____________ will make you become stronger. 根据首字母或汉语提示用适当的单词完成句子(高手进)1.At the border you will be asked your________(目的地)and how long you plan to stay.2.We passed through several________(被离弃的)villages where local people had left al 根据据以及首字母或汉语提示写单词,补全句子1.two safe g______are standing in front of the gate.2.some parents come early to school to c______their children every afternoon.3.my daughter puts on her school u_______and goes to school 根据句意、首字母或汉语意思,在空白处填上恰当的词.1.Mr Smith is playing the piano______(优美的),but it's too______(大).2.My ______(邻居) get on well with each other.3.The restaurant is c_______ to my apartment b 根据汉语句意完成英语句子,每空一词咱们去公园散步吧Let's______ _________ _________ in the park中间三空 根据首字母或汉语提示完成句中所缺的单词1.He wrote a new s _ last week 2.They went to the mountains y_3.How did kids _ (度过) the weekend?4._ (大部分)of the students enjoyed the party 问:根据句意和首字母或汉语提示完成单词. Please be careful when you c______ the street.Some students go to school by ______(小船).He lives in a small ______ (村庄)in Guizhou.often get up at h______ past six in the mornin 根据首字母、释义及所给的英文句子或汉语提示,完成下列单词的拼写1.It is late.We must find a h______ to stay for the night.2.Let us have our dinner (尽快)______.It is late. 根据首字母提示和句子意思写出单词完成句子 根据句子意思和所给首字母提示完成单词1、The c_____ of the magazine is very nice. We all like to see it2、We grow a lot of crops on the l______