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B 做一篇小学英语阅读C tan(a+b)=1/2tan(a-b)=1/3.tan2a=______tan2b=_____详细过程, 如图,三角形ABC 角C=90°,BE⊥AB且BE=AB,且BD=BC,CB的延长线交DE于F,求证:点F是ED的中点 一篇高二英语阅读AAThe story is about two old people named David and Rosy Jackson.Both of them had very bad memories.For example,Rosy would forget to cook dinner or take vegetables home after paying for them.David would show up for work on Sun A recent report on online education,made by SRI International for the Department of Education,has a serious academic (学术的) title,but a most interesting conclusion:“ Students in online learning conditions performed better than those receiving 高二的一篇英语阅读Ever thought that you'd like another life?Is real life sometimes too real?Perhaps you would be better off with a second life.Well one of the biggest phenomena sweeping the Internet is something called exactly that---Second 一篇英语阅读,Most of us grew up taking family trips to the circus,zoo,marine park,and so on．Seeing animals caught for human amusement,seemed so natural that we never questioned it．While it is considered that all humans deserve freedom,we us 一篇高二英语阅读CC2.26-meter-tall Yao Ming made his NBA debut (初次登台) on October 23,2002 and got 6 points for the Houston Rockets in the game.The next day,he got 13 points (得分)in another game.Most people think that Yao Ming is a bo 已知sin(A+B)=3/5,sin(A-B)=1/5,证明：tan A=2tan B. 西格玛求和那个式子第二步m=0到n 为什么等于第三步m=1到n啊,没看懂.概率论 de是三角形abc的中位线,f是de的中点,bf的延长线交ac于点h,则ah：he等于《 三角形ABC中,角ABC等于100度,角C的平分线交AB边于点E,点D在AC边上,且满足角CBD等于20度,则角CED等于多少度? a+b>a-b, 若|a|=|b | √a =√b对吗 B站和A站哪个好点,平常喜欢看日漫 a+b＝-【b-a】对吗?为什么?原题不是这样的是下列等式成立的是 【 】a.2[x+6]＝2x+6 b.-[x-1]=-x-1c.a-b=-[b-a] d.16-x=2[8-x] 2011年2月13日美元与人民币的汇率 怎么运用大六壬 初一地理问题（高手请进,若好加分）1地球是一个两极稍扁,____________略鼓的____________的球体.2.陆地地形分为_________、_________、_________、_________、和_________五种基本地形.3.海底地形有________、__ 国家正在实施的西部大开发的著名工程有＿＿＿＿＿,＿＿＿＿＿等你认为国家实施西部大开发战略有何意义? 明天要高考了,我就想问一个数学问题：空间向量直角坐标系,算面与角用的cos就是正弦值是不是,而二面角算的cos还是余弦值是不是 初一 地理 社会 请详细解答,谢谢! (7 13:50:1)四川盆地属于我国地势的A 第一阶梯 B第二阶梯 C第三阶梯 D最底处 0到8取4个数,这4个数求和的概率分布不能重复。简单的概率算法，9取4应该是有126种可能，我现在是想知道这126种可能中它们求和的概率分布。我说得都有点头晕。 从1到100任抽取20个数放回,再任抽取5个数,求和前20个数有相同数的概率? 从1,3,9,27,81,243这六个数中,每次取出若干个数(每次取数,每个数只能取一次),求和,可以得到一个新数,一共有63个,如果把他们从小到大一次排列起来是1,3,4,9,10,12...那么第60个数是很有道理,但是 从1、3、9、27、81、243这六个数中,每次取出若干个数(每次取数,每个数只能取一次)求和,可以得到多少个 B阅读、求答案 求B的阅读的答案! 怎样转魔方,有什么口诀 阅读B篇求解答QAQ 完成一面两层后,魔方还应该怎么转（要图解,不要口诀或公式）要图解,不要口诀或公式!我看不懂!