Từ 4 tiếng "núi, non, sông, nước" có thể ghép được nhiều nhất bao nhiêu từ ghép có 2 tiếng?

Ta có dãy số:0;1;2;3;4;5;.......;2013.

SSH:(2013-0):1+1=2014

TBC dãy số là:[(2013+0).2014:2]:2014=1006,5

huhu ai đó giúp tớ với

Số bạn đạt được điểm mười là 30 bạn (vì tổng chúng = 3 và lớn nhất)

Số bạn đạt điểm 9 là : 30+12=42

ĐS:****

1, My brother is in class 12A

2, Trang's school is on the second floor

3, Minh gets dressed at six fifty

4, What time is it?? - It's four o'clock

5, We have breakfast at seven fifteen

6, This school is big. It is a big school

7, How many floors does Mai's school have??

8, Viet washes his face at six thirty

My favourite food is fried rice with vegetable and chicken curry with salad. This is, in fact, the most popular menu in our country. The rice is first boiled in water and then the boiled rice is fried with some chicken and vegetables and oil. The chicken curry is prepared separately using some spices and chicken and finally, the salad is prepared using different vegetables and fruits and then those are cut into pieces and mixed together with mustard. Then these three items are served together.

I eat this menu approximately 3-4 times in a week. This menu is prepared at home mostly and sometimes I eat it in a restaurant. There are some variations in the way this food is prepared and the ingredients using which this food is made. Different restaurants have their own speciality in preparing and serving this menu.

This is my favourite food for many reasons: firstly it is very delicious and healthy. This menu meets the demand for different food values our body needs. It is available in most of the part in our country. Thirdly, I like it as it offers the variations of tastes. Moreover, it is not that much expensive to prepare and does not require o much effort to prepare. For all these reasons it is my favourite food.

A. Do you know the sbjects? What are their Vietnamese equivalents?

1. Art: Mỹ Thuật

2. English: Tiếng Anh

3. Geography: Địa Lý

4. History: Lịch sử

5. Maths: Toán

6. Music: Âm nhạc

7. PE (Physical Education): Thể dục

8. Science: Khoa học

9. ICT (Ìnormation and communication technology): Công nghệ thông tin và truyền thông

B. Do you know any more subjects? Write them down.

Literature,Chemistry,Biology,Geometry,Physics,...

C. Ask and answer the questions.

1. Which subjects do you do at school?

They're Maths,Literature,Foreign language,Physics,Biology,History,Civic Education,Geography,Information Technology,Art,Technology,Music,Physical Education.

2. What's your favourite school day?

My favorite school day is Monday.

1. Teacher

2. Student

Ta dễ thấy: 2004\(⋮\) 3 \(\Rightarrow\) 2004\(^4\)\(⋮\)3 ; 2004\(^3\)\(⋮\)3 ; 2004\(^2\)\(⋮\)3 . Mà 23: 3 dư 2 nên n=3k+2. Ta biết số chính phương không có dạng 3k+2, do đó n không phải số chính phương(đpcm).