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已知E.F.G.H分别是空间四边形ABCD边AB,BC,CD,DA的中点,用向量法证明E,F,G,H四点,证明BD∥平面EFGH 高数的几道计算题问题!题比较多.辛苦了 .多给点儿分儿 大答题哪亲 淘气包马小跳好句 求可以表达自己伤心的句子!近来不太开心,想写日记把它记下来!所以请网友多找一些给我参考! ∫cos(lnx)dx 几道简单的高数计算题考研的时候学过,现在学弟问我,一年了都忘了,谁能点拨一下.写出答案可能比较困难,描述一下就好,谢谢。。。答案我已经写好了，谁来随便回答一下我好采纳啊 【不定积分】求教高数一道不定积分,看不懂 求解第二个等于后面怎么出来的 【不定积分】求教高数一道不定积分,看不懂 第二个等于后面看不懂是怎么出来的 高数,求不定积分.看不懂, 紫菜与西红柿鸡蛋能放一起做汤吗? 高数求不定积分 看不懂这个题 高手帮帮忙 感激不尽 求可以表达自己伤心的句子!求可以表达自己伤心的句子!近来不太开心,想写日记把它记下来!所以请网友多找一些给我参考! 生物膜系统之间如何相互转化?如高尔基体和细胞膜之间如何相互转化?怎么样实现”相互”之间的转化？我们平时所见只是从高尔基体形成囊泡到达细胞膜与膜融合 那如何从细胞膜转化为高 修改英语作文的错误Welcome to our school.We did a survey of our students and this is a result about what we learned.Students will help each other if they study in groups.In their opinion,working together in a group is important.They can talk 修改一下英语作文的错误I got my report card today.Lucky is I tests is good.This semester my math class study is very easy,and my math teather said I was very hard-working.But my history testher said Icould do better too.And my geography res 帮忙改英语写作中的错误,In order to improve the quality of education,high school students should be encouraged to evaluate and criticize their teachers,but others think it will result in loss of respect and discipline in classroom.Discuss b 求高手帮我修改英语作文的错误Our hometown is Laohekou.我们的家乡是老河口It is near the Hanjiang River.它在汉江旁边 It is very clean and beautiful.它很美丽和干净Its nick name is small Hankou.它的绰号是小汉口H 英语作文修改,Susan was a pupil of the school of the air.It took her five mintues to walk across her farm to get school.The school days lasted from 8:45 to 12:00.The number of 12 pupil inthe school.The school had some advantages.There was few pu 成语 最有胆量的人 最有胆量的人是什么成语 高数中求导： 一道高数题,.已知f(x,y),φ(x)有连续的偏导或导数,且f(xz,yx)=x,φ(x+yz)=1.求:dz/dx 一道高数题, 帮我看看这篇英语作文有没有错,帮我修改一下 这篇英语作文有没有错,要怎么修改顺便打个分 番茄蛋面应该把番茄切成什么形状 蛋炒西红柿的做法? 表示勇敢顽强的词语还是一样,最好是成语,要10个噢没有10个也行,只要有就好了,我加分 先勇敢顽强的词语有哪些? 最长的脚用什么成语表示?巧填成语 最有胆量的人,求成语 描写真挚友情的诗句.