ta thấy : 2012 : 4 = 503 => lá cờ cuối cùng của các lá cờ mà lá cờ cuối cùng theo thứ tự là màu vàng

vậy lá cờ thứ 2012 có màu vàng

lập luận của mk hơi khó hiểu sorry nhé!

Cháu :15

Ông:63

ai mà tk mk

thì mk tk lại

hứa luôn

yên tâm

Cho tam giác ABC có AB < AC . Gọi M là trung điểm của BC , từ M kẻ đường vuông góc với tia phân giác của góc A , cắt tia này tại N , cắt tia AB tại E và cắt tia AC tại F . Chứng minh rằng :

a, AE = AF

b, BE = CF

c, AE = \(\dfrac{AB+AC}{2}\)

Trên quãng đường Kép - Bắc Giang dài 16,9 km, người thứ nhất đi từ Kép đến Bắc Giang, người thứ hai đi từ Bắc Giang đến Kép. Vận tốc người thứ nhất so với người thứ hai bằng 3: 4. Đến lúc gặp nhau vận tốc người thứ nhất đi so với vận tốc người thứ hai đi là 2: 5. Hỏi khi gặp nhau thì họ cách Bắc Giang bao nhiêu km?

Section I. Choose the word that has different stress from others.

1. A. complete B. detective C. gather D. event

2. A. mixture B. allow C. affect D. disease

3. A. exit B. cushion C. turtle D. improve

4. A. museum B. useful C. cavity D. wedding

Section II: Choose the best answer from A,B,C or D to fill in the gaps.

1. She is staying................................her uncle and aunt's house.

A. at B. in C. with D. on

2. Their trip to Da Lat ....................wonderful.

A. was B. were C. are D. is

3. There is............................meat in the box.

A. any B. a few C. a little D. many

4. Don't forget .....................your teeth before going to bed.

A. brush B. to brush C. brushing D. not to brush

5 You ............................stay at home when you are sick.

A. had better B. should C. mustn't D. A and B

6. He doesn't like candy. I.................

A. don't too B. don't, either C. don't neither D. do so

7. I divided the sweets.....................several boys.

A. during B. between C. into D. among

8. He was only ten, but he ate........................his father did.

A. as much as B. more that C. much than D. as much than

Section III: Supply the correct tense for the verbs in brackets.

1. My mother often (go)..............to the market every morning but she ( not go)....................there this morning.

=> .........................................................................................................

2. When (you/ have).........................the last medical check-up?

=> .........................................................................................................

3. Why ( you/ not take) ..................part in the picnic last Sunday?

=> .........................................................................................................

4. Where ( your teacher/ be)....................?

- He (explain)......................a new lesson in that class.

=> .........................................................................................................

=> .........................................................................................................

5. I (pick)...............you up at your hotel in half an hour.

=> .........................................................................................................

6. We can't go out now because it (rain) .

=> ................................................................................................

Section IV: Give the correct form of the words in brackets

1. The noise in the city kept Hoa...................at night. (Wake)

2. In................to that, my bike tires was flat. (Add)

3. Mr. Tan has a very...............................tooth. (Pain)

4. Then, Thanh.................a pan and stir-fried the beef. (Hot)

5. Sugar is not an......................food because we need it to live. (Health)

6. Catching the common cold is..................for every body. (Please)

7. Don't worry! Your cold will last for a few days and then................ (Appear)

8. I have.................time to play than my friend. (Little)

Section V: Finish each of the following sentences in such a way that it is as similar as possible in meaning to the sentence printed before it.

1 Listening to music is more interesting than watching TV.

=> I prefer........................................................................................................

2. It isn't important for you to finish the work today.

=> You don't......................................................................................................

3. How much is this dictionary?

=> What ........................................................................................................?

4. How heavy is the chicken?

=> What...........................................................................................................?

5. Mr. Trung and Mrs. Trung type quickly .

=> Mr. Trung and Mrs. Trung..................................................................................

6. I got to work in half an hour yesterday.

=> It took ..........................................................................................................

7. My mother doesn't like coffee and tea.

=> My mother likes neither....................................................................................

8. You shouldn't eat too much candy.

=> You'd...........................................................................................................

Tìm \(x , y ,z\) biết : \(\dfrac{x}{z+y+1}=\dfrac{y}{x+z+1}=\dfrac{z}{x+y-2}=x+y+z\)

Tìm số tự nhiên x , y biết : \(7(x-2014)^2=23-y^2\)

Tìm số nguyên dương a lớn nhất sao cho : \(2004! \vdots 7a\)

Tìm tất cả các số nguyên dương n sao cho : \(2^n-1 \vdots 7\)

Please help me !