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棉花糖糖 · 发表于 2006-11-13 06:47:20

[quote=4everluv][隐藏内容][/quote]

游客，如果您要查看本帖隐藏内容请回复

Nemesis-G · 发表于 2006-11-13 06:53:34

Ahh,have to go now....I have just saw my teacher under the building....
Wish you all have a nice day~

棉花糖糖 · 发表于 2006-11-13 06:54:28

[quote=Nemesis-G]Hi Hiddern,glad to see you~
Candy was online....[/quote]

you can sometimes see me online but actually iam not reading the page

i would open the page but because of some parents problem i ll never got to see it~

so don't mind me

hiddern70 · 发表于 2006-11-13 07:30:34

by the way, candy. I saw you have a math question on your posts. (Well, If you don't mind:030: :028:)I'll show you the step.

I use "X" to express mutiply, and use "a" replace "x"

xxxxx(a+8)^(1/3)-2
lim _______________
a->0 xxxxx    a



xxxxxxxxxx[(a+8)^(1/3)-2]             xxxxxx[(a+8)^(2/3) + 2(a+8)^(1/3) + 4]
=  lim ____________________ X ____________________________________________
a->0       xxxxxxxxxxxa                xxxxxxxxxxxxxx[(a+8)^(2/3) + 2(a+8)^(1/3) + 4]

我先解释一下，这到题的关键是要先将分子有理化。

所以，要将分子变成 a^3-b^3  的形式。Ps: a^3-b^3=(a+b)X( a^2+ab+b^2)
(sorry about this part, because I don't know who to explain this step in English:030:)

xxxxxxx[(a+8)^(1/3)-2] X [(a+8)^(2/3) + 2(a+8)^(1/3) + 4]
= lim       ____________________________________________________
xxa->0             xxx(a) X [(a+8)^(2/3) + 2(a+8)^(1/3) + 4]



xxxxxxxx[(a+8)^(1/3)]^3 - 2^3
=    lim ____________________________________________________
xxa->0    (a) X [(a+8)^(2/3) + 2(a+8)^(1/3) + 4]

xxxxxxxxxxxxxxa+8-8
=  lim ____________________________________________________
xxa->0 xxx(a) X [(a+8)^(2/3) + 2(a+8)^(1/3) + 4]

since 8-8=0, and "a" at numerator could cancel the "a" at denominator.
Thus:

                              xxxxxxxxxxxxxxxxxxxxxxxxxx1
=  lim ____________________________________________________
xxa->0    xxxxx(a) X [(a+8)^(2/3) + 2(a+8)^(1/3) + 4]

Now, we can put a->0 in the whole equation.

xxxxxxxxxxxxxxxxx1
  = lim ___________________________________
xxa->0  x[(a+8)^(2/3) + 2(a+8)^(1/3) + 4]

= 1/12

That's it. he he........ :034::034:.  Any  question on that?:015:

SSV · 发表于 2006-11-13 08:59:26

[quote=棉花糖糖]delete the 2nd part of nonsenses~ and you will never say something like that again~ or i won't ever talk to you~
[COLOR=darkred...[/quote]

I will delete that part for you Candy, but... it's not because I'm scared of you, it's because I <3 U, okay? I want you to be my friends.

SSV · 发表于 2006-11-13 09:02:52

[quote=hiddern70]by the way, candy. I saw you have a math question on your posts. (Well, If you don't mind:030: :028:)I'll show you the step.

I use "X" to e...[/quote]

You did well, 70. I thank you.

SSV · 发表于 2006-11-13 09:03:54

[quote=4everluv]gotta to go work TAT....[/quote]

Hi, there. You're just like Mel, having to much work to do on weekends.

大肚肚 · 发表于 2006-11-13 10:15:47

nicely done, gunners....-v-.....

SSV · 发表于 2006-11-13 10:17:40

[quote=大肚肚]nicely done, gunners....-v-.....[/quote]

Who are gunners, Big Dudu?

大肚肚 · 发表于 2006-11-13 10:23:48

Almunia, eboue, clichy, toure, gallas, hleb, flamini, gilberto, fabregas, van persie, henry and arsene wenger are the gunners of today....

棉花糖糖 · 发表于 2006-11-13 10:36:50

[quote=SSV]I will delete that part for you Candy, but... it's not because I'm scared of you, it's because I <3 U, okay? I want you to be my friends.[/quote]

i don't like ppl who are mean~ i won't ever be friends with them~

棉花糖糖 · 发表于 2006-11-13 10:37:58

[quote=hiddern70]by the way, candy. I saw you have a math question on your posts. (Well, If you don't mind:030: :028:)I'll show you the step.

I use "X" to e...[/quote]

thank you >< got it now~
and that formate looks so beautiful~~ :027:

SSV · 发表于 2006-11-13 11:08:12

[quote=大肚肚]Almunia, eboue, clichy, toure, gallas, hleb, flamini, gilberto, fabregas, van persie, henry and arsene wenger are the gunners of today....[/quote]

I know Henry, but have never heard of the rest. What team are they in?

大肚肚 · 发表于 2006-11-13 11:13:22

the gunners are always together, if you only know thierry, there's no need to mention the club

SSV · 发表于 2006-11-13 11:13:48

[quote=棉花糖糖]i don't like ppl who are mean~ i won't ever be friends with them~[/quote]

That's okay, I'm not "people". So can we be friends now? And also I'm mean to you, because you're meaningful to me, get it?

4everluv · 发表于 2006-11-13 11:14:29

[quote=棉花糖糖][隐藏内容][/quote]

thas cool! thx^^

大肚肚 · 发表于 2006-11-13 11:18:13

[quote=SSV]That's okay, I'm not "people". So can we be friends now? And also I'm mean to you, because you're meaningful to me, get it?[/quote]
:029:please get your lips off her butt...that's very not pleasing to the eyes:026:

SSV · 发表于 2006-11-13 11:27:48

[quote=4everluv]to rationalize the numerator^^

wow, that was cool~!!~!! i suck at calculus....[/quote]

Yes, indeed.

大肚肚 · 发表于 2006-11-13 11:28:18

[quote=4everluv]
[隐藏内容][/quote]
:013:hmm, i know

SSV · 发表于 2006-11-13 11:29:59

[quote=大肚肚]:029:please get your lips off her butt...that's very not pleasing to the eyes:026:[/quote]

It's okay, Big Dudu. I think a smart people like you can see or understand everything with your eyes closed.

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