谢啦：既然胶体带电的原理是优先吸附与其组成相关的离子,那么Fe（OH）3胶体吸附的是什么离子?

c1/b1+c2/b2+…+cn/bn=a(n+1) ①
c1/b1+c2/b2+…+c(n-1)/b(n-1)=an ②
∴①-②得cn/bn=a(n+1)-an=2
∴cn=2*3^(n-1)
∴Sn=(3^n)-1
∴c1+c2+c3+…+c2004=S2004=3^2004-1

如果这些都同时出现,先表达小的时间,再大的时间.比如
3:20,Sunday,September 9th,2010

热爱数学、喜欢数学是前提， 独立思考、刻苦训练是根本。 归纳总结、掌握规律是诀窍， 一题多解、举一反三是捷径。 数形结合、数式代换最常见， 因果互索、推理论证是核心。 顺逆思维、严谨周密是法宝， 重点复习、练有所得要记清。 首先不要怕数学，数学就像其它所有学科一样，是每个学生都能学好的。要相信自己，相信自己也能向数学成绩好的同龄人一样，把数学学好。 不要怕难题，至所以难，是因为你不熟悉其中的条件和结论、或各数量之间的关系，当你能看出这些关系的时候，你就不觉得它难了。而要能看出这些关系，又只能从最基本、最简单的地方开始训练——而这又恰恰是许多同学不感兴趣的地方，他们往往认为太简单了。你看奥运会上那些体操冠军的动作难不难？他们可都是从最基本、最简单的压腿、下腰等动作开始训练的。数学学习也是这样，那些做难题非常顺手的同学，都是从认真地做好每一道简单题开始的。 任何复杂的、难的数学题，把它拆开来看一看，都是由若干个简单的题组成的，如果谁能很快地把难题拆成几个简单的小题，这个难题就不难了，这个人也就成了一个解题高手了。因为这种能力就是我们说的“分析能力”。 怎样才能迅速地把一道数学难题“分”或“析”，成为简单的小题呢？只有一个办法：认真作那些不起眼的“小题”，当你非常熟悉它们之后，它们就会忠实地报答你：让你成为一名会解数学难题的高手。 以下几点建议供参考： 1、不要死记硬背； 2、数学有肉眼看不见的“数学思想”，它是数学的灵魂，在学习中要时时注意领悟它，抓住它； 3、在坚决反对“题海战术”的前提下，一定要强调做一定数量的数学练习； 4、做好一个准备：越学到后来，越抽象，同时也越灵活、越有趣； 5、从小学开始，数学知识就环环相扣，不能遗漏一点一滴；若有遗漏，要及时补上； 6、不要怕知识障碍（如遇到难题等），数学真功夫就是在数学障碍面前练出来的； 相信自己，从简单、基本的地方（同时也是最重要的地方）着手，不要着急，一定会有所收获。

1、五乘以十的八次方秒（约8分钟）
2、√
3、×
4、7
5、一个27.5 另一个62.5
6、A在哪里?
7、1000
8、540
9、5.256乘以十的十六次方种可能性；10的19次方大
10、百分之78.9（不确定,乱做的,不会）
11、1.582
12、3；3.1；3.14；3.141；3.1415
这都是我自己做的,没有参考,有的不确定,敬请谅解!希望可以帮到你的忙!不过还是希望你以后自己做哦!

In order to complete these orders quickly, I would like to invite you in the middle August or earlier time to these factories for testing.
In this way, we could solve some controversial problems releted to quality before packaging in the factories. If you agree, I will plan for your trip as soon as possible.

参天的胡杨欣欣向荣地生长在大漠戈壁.
百度这个网站人气极佳,搞得欣欣向荣、热火朝天.

丹之所藏者赤
君子之交淡如水,小人之交甘若澧

8.测试结果是除了猪八戒动了凡心（想留下做她们家的女媚）其余三人均不为所动.猪八戒在本回最后受到四位菩萨的惩罚,被吊在树上受了一夜的罪.
9.他目的不是去放马,而是借故离开唐僧师徒,去找“那妇人”,自荐要做她家的女婿.

f(x)=log3((mx^2+8x+n)/(x^2+1)) 值域为[0,2]
所以0

It was sunny yesterday

前序,父节点-左子树-右子树：根节点A,左子树看到T,然后T往下没有左子树,读到右子树B,B的左子树Z,之后没有了就层层妇女会到根节点,右子树X,X下面左子树C,C下面没有左子树,右子树Y,到底了返回到X节点看他的右子树P,到底了结束.结果：ATBZXCYP
中序,左子树-父节点-右子树：从根节点A开始往左边看到T,T没有左子树所以第一个是T然后看他的右子树到B,B有左子树Z,所以先是Z再是B,左边看完了返回到根节点,读入A,然后是A的右子树,从X往左看,再从C往左边看没有,所以就是CY,返回到X,读入X,再是P,结束.结果：TZBACYXP
后序,左子树-右子树-父节点：类上,

My Hometown Welcome to my hometown! Fujian is my hometown. It is a modern and busy province. It has a long history. There are many big supermarkets, beautiful gardens and good factories here. It is very easy to go shopping. You can see green hills, big trees and nice flowers. There are many restaurants in Haimen. You can enjoy Haimen goat. It tastes very delicious. Many visitors come here to enjoy it. There are many good places to visit. There is a park and a big Shopping Mall. You can see films in Renmin Theatre. My school is one of the best schools in my hometown. It is on Changjiang Road. It is very beautiful. I hope you can come and visit soon.

My refrigeratorMy family has a refrigerator sets of licensing its color is white and white winter snow,so pure.It is about1.6 metres high,:,is about:1 meters wide.It was a cold room,can put the vegetables.The following is a freezing chamber,can put the ice cream,also can make ice cream.Refrigerating room there is a button,name is defrosting button,when the refrigerating chamber cream lot,it will start automatic defrosting function.Since the refrigerator,we work more convenient.For example,our home after dinner there are still a lot of rice and vegetables.Ago,grandma who had dropped,if we eat a bad stomach.I looked at feel very waste.But now,since the refrigerator leftovers leftovers,and can be placed in cold storage rooms,not tomorrow,will be broken.So do not have to waste.In the hot summer,the freezer can we contribute the delicious ice cream.Remember that summer,the weather is very hot,burning sun hung in the air,the cicada in the tree can't stop shouting" cicadas,cicada." I 'm sweating like a pig,I said to his mother:" Mom,we have a refrigerator,it is better to be a ice cream!" Mother said:" good ah!" Then,I find her mother for 20 dollars,down to the shops to buy some ice cream material,and then return home to start making up.Well,I put the ice cream into the refrigerator freezer below ice up,and then I will read a book,I am in the room,the heart is flying to the kitchen,so I went out to see the ice cream is not good for a while,then in mother saw it,said to me:" Chun Zi,you not while out for a trip,so that ice cream will be good." Then,I spent 3 hours later,look at,really well.I eat delicious ice cream,thought a refrigerator!