北京丰台二中怎么样

∫（1一COSX）/（1十COSX）dX ∫1/(1+cosx)dx ∫x(1-cosx)^2 dx具体步骤怎么算? ∫(-1,+1)x/(2+cosx)dx求这个定积分 甘肃有哪些煤矿企业,地址是哪里!越多越新越好` 请多多帮忙,一道数学题,对于你们来说应该简单若函数f(x)与函数g(x)=(1/2)x的图象关于直线y=x对称,求函数y=f(4x-x^2)的单调区间. 一道数学题望多多指教近期,我市一新建室内游泳馆正式投入使用,其中A2号水池有01、02两个进水管,单开01进水管,灌满水池需（a-1）小时；单开02进水管,灌满水池需（a+1）小时,现在01、02两管 一道简单的数学题,望人来看看!已知直线ab与x轴负半轴、y轴正半轴分别交于a、b两点,oa、ob的长度分别为a和b,且满足a=b正比例函数y=kx（k 原来两个鱼缸的金鱼条数同样多,后来从第一缸取出15条放入第二缸,结果第二缸的金鱼条数正好是第一缸的两倍,现在两缸各有多少条金鱼?要用和倍问题和差倍问题解决, 请问第五题这么填对不对（初一英语） ∫(1/1-cosx -1/1+cosx) dx ∫ (1/(1+cosx))*dx求解啊, 怎样理解线性代数中的秩?能否通俗点，打个比方最好跟生活相关的例子。 找出有错误得一项并改正!急(What's) (the wrong) (with) (your hand).( I) can't (find) (my) way (to home).(It's) kind (for) you (to)help (us) a parabolic arch has a span of 120 feet and a maximum height of 25 feet.choose suitable rectangular coordinate axes and find the equation of the parabola.then calculate the height of the arch at points 10 feet,20 feet,and 40 feet from the centre. 找出错误得一项,并改正,急(Who) (shoes) (are) (these)?(It's) (the time) (to) (get up) 有错误请指出,并改正 初一英语题 找错并改正()1.I _am_ _not_ _come_ _from_ Beijing. _____________ A B C D()2._Let_ me _find_ it _in_ the computer _first_. ______________ A B C 初一英语找错I like spring best.Because it often rains but warm.It often windy days .I can fly a kite in the park.(有没有错?如果有在哪?怎么改?) 第2题找错并改正1:Some homewrok were done by me 2:The cup is must kept clean 3:A new hospital set up in my hometown last year 4:Some books were sent me by the teather 5:Linda,the dress is nice.Where did it make 初一英语作文 找错谢谢 ∫(1-cosx)/（1+cosx）dx 内蒙古都包括哪些地区城市 内蒙古西部区包括哪些盟市 内蒙古有多少地方有草原啊? 快,错的纠正下, 初一英语改错误1、The boy over there are my son.2、Your shoes are black.Mine is pink.3、Let me look the map.4、They are twin.They are the same age.5、The windows are on the wall of the classroom.6、Peter sister likes thrillers.7、Mary wa 求∫(1-cosx)／(1+cosx) dx怎么得到积分结果呢? 高寒地区的标准是什么?就是问问高寒地区是怎么划定的,谁给说说?大兴安岭是不是算作高寒地区 黑龙江什么地方属于高寒地区 高寒冻土地带是什么意思 找出句子中的错误病改正（初一英语）1.Please come and have a look my new watch.2.You can go here with your parents.3.How about to draw a picture for the little girl?4.There is little water in the cup,isn't there?5.We still have a littl