數學一問(10點)(緊急)

1.以相同大小的正方形覆蓋一個36cm乘48cm的長方形。求剛好覆蓋整個長方形所用的正方形的最大尺寸。

36cm÷2=24

2.鐘A每18分鐘響一次,鐘B每27分鐘響一次。如果它們在正午十二時一同響,問它們會在何時再一同響?

12:54

3.從某個分數減去(三分之二)時,結果是(十五分之二)。求該分數。

十五分之二+三分之二=十八分之二

2007-08-20 20:59:50 補充：
我已經用了我最大的能力,希望有用。經過我哥哥的檢查。我哥哥是大學生。

You have to finish the exercise book: New Syllabus F.1 Maths Preview Summer Vacation Exercise, I think, right? Ahha, I've finished it already.

You have to thing of it! Work harder and harder until you know the answers, just do it!

And, do you know, there are Brief Notes in the book? You have to read it very very clearly! Don't afraid of English! It can help you, it could help me to finish the exercise and it will also help you to finish the exercise, too, trust me.

When I started to do the exercise book, I feel hard and I don't want to do it, just like you. But I try to understand the questions and do my best. Now, I have overcame already, I felt so prowd of myself!

Come on, they're just questions but not monsters! You can't just copy the answers from others, you can't always copy and copy!

I can give you some tips :

1) "以相同大小的正方形覆蓋一個36cm乘84cm的長方形。求剛好覆蓋整個長方形所用的正方形的最大尺寸。" is asking you to find the

L.C.M

of the rectangle's size (36 by 84).

2) "鐘A每18分鐘響一次,鐘B每27分鐘響一次。如果它們在正午十二時一同響,問它們會在何時再一同響?" is asking you to find the

H.C.F

of 18 and 27.

They will be next rung toghether at:
12noon + ??mins
=12:??p.m.

3)
The fraction is:
2/3 - 2/15
= ?/?

Here are my tips, they're useful, hope I can help you.

P.S. I have thought of answering you in Chinese cause' I am afraid of writing in English. But I changed my mind and I thought I must try my best to learn English and train myself at anytime. That's why I wrote in English to answer you at last.
You should never give up, be strong and bold, go ahead, now!

2007-08-20 21:37:38 補充：
I know their answers are WRONG, I have theNUMERICAL ANSWERSof F.1 Maths Preview (P.6~F.1)!!!

2007-08-20 21:38:39 補充：
Ha~Send an e-mail to me to ask me to help you check your answers when you finish them... I can't just tell you the answers and let you keep copying and copying!Work harder, today is 20/8 already!!!

１.　（36+4)*(48+2)
=40*50
=2000
你呢題應該係關於誤差問題吧。

２.　呢題應該係求18同27的公倍數
所以係54 甘就係12：54

3. 2/3+2/15=12/15

我想問係未小學問題啊````

1: 我唔明

2: 12:54

3: 45分之26