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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______ 根据句子的意思及首字母提示,填写单词,完成句子——What's the s___?----It's two to two nowAmerican fast food is the most p_____in the worldWhich is your f__sport?The farmers grow many v____in the fieldExcuse me,which is the way to 根据句子意思和首字母完成单词1.The twins are m_____of the club.2.Nancy l_____watching TV at home.3.Talking l_____to your parents is not polite.4.This boy is c_____Jim Green.5.Our team won the match,all the players are r_____great!6.Peter 根据句子意思和字母提示完成单词Do yuo want to K_____ something about my school 根据句子意思及首字母提示完成单词It's 11 o'clock now and they have a( ) had lunch.Come s quickly as p ( ),please.Light traels faster than s( )It will be u ( ) for her to have no news of her family.I 根据句子意思和所给首字母提示完成单词1.You shoule'nt a( ).You should sit down and have a good talk2.The children under p( )feel tired every day3.I'm very weak in math,I'd like to get a t( )4.Children also need tim 英语问题 急需帮忙 （根据句子意思和首字母提示,写出相应单词）1:I hope you won't be too s____ by all the tall buildings around you when you visit our city.2:What bad weather! It has snowed s____ the day before yesterday.3:H