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代数已知a+b=2,ab=-1,求下面代数式的值（1）5a^2+5b^2(2)(a-b)^2 beautiful young people are accidents of nature, but beautiful old people are works of art.Beautiful young people are accidents of nature, but beautiful old people are works of art.什么意思啊 不会 啊 谁 告诉我谢谢 请问he is one of my father's friends为什么要加ONE teenagers are young people between the ages of 13 and 19.they are no longer children,or they are not yet adults .they express themselves through their own music ,clothes and language .there are more than 36 million teenagers in America. 乌贼有什么本领 含有鸟字的古诗文谢谢 谁能告诉我含有“鸟”的古诗和成语? 初一数学倒数第一题和倒数第三题 乌贼有什么奇特的本领 乌贼的奇特本领是什么? 为什么说锤头松了,将锤柄在地上撞击几下就紧了而不是说锤头松了,将锤投在地上撞击几下就紧了呢? nowadays a lot of young people like to have their hair ________.A.color B.colored C.coloring "shanzhai(山寨）is a way for young people to have their voices heard."怎么翻译? 我数学一直比较好,可是到高三了,反而成倒数了, 我变得特喜欢化学,因为化学对了就是对了,错了大部分是因为哪个知识点不知道,掌握那的知识点后,我变得很高兴,感觉化学又进了一步也挺喜欢的,掌握和体会那一道题的解题过程,也是很舒服 现在第一轮复习,做的基础题都不会!一点映像都没了,而且老师讲的都很快,现在讲三角函数什么都不知道!题目一点都做不来…也就只知道背背公式,可是背了根本用不上去…基础太差了!有些甚 How do young people have their birthday,急 Which(A) drink do(B) you like better ,tea(C) or orance(D)?Which(A) do(B) tea(C) orance(D)找错并纠正 Which is better to drink,tea or milk Which is the better to drink,tea or milk 这两个句...Which is better to drink,tea or milk Which is the better to drink,tea or milk 这两个句子哪个对 如果6（1）班全班共50人,则选举小明当班长的有几人?小明48%票 would you like a drink of milk?这是我困惑的来源英语I(1)课程答疑解惑（Units 3-4） 中央电大外语学院 崔松 2、Unit3 Activity4中有这么一个词组:a drink of milk.这里面的drink 　　Drink 在这里表示的是“一 The bottle is (full)l of milk.Would you like to drink some?将上句中括号中full加、减或改变一个字母构成新词,填入下句空白处I think some English are ______,But most of them are easy to remember. 英语翻译,安没有棒球球拍.是用don't还是doesn't?帮偶翻译一下 英语翻译是用英语呀，不是汉语呀， 一个禁止圈,里面有一只狗,是什么标志?求英文翻译：Don't __________ Does Tom likes play volleyball?有什么错误? Tom always talks ____but does_____.so everyone likes him.A.fewer little B.less more C.more less D.many much.选择什么?为什么? 外语教学与研究出版社 用英文怎么说 2012年100万存银行一年定期有多少利息 100万存银行5年定期有多少利息? 改错Peter's pen and Millie's pen are like. 我有100万存银行存5年,利率是多少,能一年一取利率吗?