ln(x+y)的导数

The Professional Development什么意思 华尔街英语的口语教学怎么样啊?口语实在是烂! 解一道几何证明题引三条直线分别平行三角形的三边,每条直线与其所平行的边之间的距离等于该边的长度,同时,对于每条边,平行i、于它的直线和该边所对顶点位于该边的两侧.证明：三角形 we manufacture the professional look for managers 一道几何证明题,直角梯形ABCD,角C=角B=90度,E是BC上一点,连接AE、DE.已知AD=AE,AB=BC,求证CD=CE,最好很快有 什么意思the Professional Engineers Act.Revised StatutesProfessional Engineers Ontario,25 Sheppard Ave.,W.,Ste 1000 Toronto ,ON,M2N 6S9 416 224-110这句也帮忙翻一下，国外的简写不知道啥意思 the pro’s and con’s 啥意思?I make important decisions by examining all the details and then weighing the pro’s and con’s for each decisionthe pro’s and con’s 可否换成the advantages and disadvantagesmzymy翻译的好象不通顺啊, 华尔街英语的口语教学是不是很牛? by the beatles是啥意思 怎样辨别主语、谓语和宾语 靴子 英语怎么拼? 主语,谓语,宾语是怎么区分的? 披头士a day in the life寓意这首歌的创作背景是?最后那段的地名那些holes是什么意思? 想知道华尔街英语在口语这块效果好不好? 华尔街英语的口语效果好吗? 华尔街英语的口语好不? What letter is question? 英语翻译her boots kills me kill加s还是不加s 求英文翻译一句谢谢 “我这靴子到小腿这（这么高）” Jane doesn’t drive yet, but she wants____. A)the own car B)an own car C)the car of her own D)a carof her own 的选项是（）,谢谢!最好有解释. 我想借妈妈的靴子去参加聚会英文翻译 靴子是白色的,用皮革制成.英文翻译是什么 do the laundry翻译? Let's do the laundry .改为同义句_______ _________ doing the laudry?要快哦 （ ）the laundry do还是make do the laundry可以指自己动手洗衣服吗? 英语翻译l [ ] boots [ ] going hiking. We have many sports(sport)culbs(club). She saw a pen on the ground and____?A ahead B befor C after D ago Jenny,along,the,saw,was,the,running,accident,street,when,she连词成句 英文翻译：一位女士经过时看到了事故的发生,A woman saw the accident happen while she was —— —— 他们的愿望是jonin a sports club用英语怎么说jonin a sports club不用翻译