Lần lượt hạ DM, EN vuông góc AH tại M, N
ta có $\widehat{ADM}=\widehat{CAH}$ (góc có cạnh tương ứng vuông góc) (1)
AD =CA (2)
$\widehat{DAM}=\widehat{ACH}$ (góc có cạnh tương ứng vuông góc) (3)
từ (1, 2, 3)=>$△ADM=△CAH$ (g, c, g)
=>DM =AH (4)
c minh tương tự $△AEN=△BAH$ (g, c, g)
=>EN =AH (5)
từ (4, 5) =>DM =EN
mà DM //EN
DMEN là hình bình hành
=>MN đi qua trung điểm I của DE
hay AH đi qua trung điểm I của DE (đpcm)

Vì x chia 2 dư 1,x chia 5 dư 4 nên x tận cùng là 9.

Mà x chia 3 dư 1 nên phía trước số 9 phải là một số sao cho số đó nhỏ hơn 20 và chia cho 3 dư 1 và chia 7 dư 4(vì 9 chia hết cho 3 và để chia hết cho 7 thì nếu tận cùng là 9 thì chỉ có số 49)

Các số chia cho 3 dư 1 mà nhỏ hơn 20 là:4;7;10;13;16;19.

Nhưng trong các số nêu trên thì chỉ có số 4 chia 7 dư 4 nên số x là 49.

             Đáp số:49

1. Her new house isn’t so/as big as her old one.

2. Peter is the tallest in my class.

3. The white dress isn’t so/ as expensive as the black one.

4. According to me, Maths isn’t so/as easy as English.

5. Mary is the most intelligent in my group.

6. The Nile is the longest river in the world.

7. No mountain in the world is higher than Mount Everest.

8. She is the prettiest girl I have ever met.

9. The more he works, the more tired he feels.

10. That computer doesn’t work so/as well as that one.

11. The bigger the apartment is, the higher the rent is.

12.The better the joke is, the louder the laughter is.

14. The fatter she gets, the more tired she feels.

15. The older he gets, the less he want to travel.

16. The more difficult the games are, the more excited the children are.

17. The faster people drive, the more accidents happen.

18.The more I meet him, the more I hate him.

19. The less time my boss has, the better he works.

20. The more money he has, the more he wants to spend.

21. The more books you read, the more knowledge you will have.

22.The more he speaks, the more bored people feel.

23.The more the economy grows, the better people’s living condition is.

24. The farther people travel, the more the learn.

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 cup 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 specialty 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.

are there any......of water in the kitchen?

a kilos

b grams

c bottles

d boxes

Nếu thêm vào số bé 333 đơn vị thì được số lớn,vậy 333 chính là:

          10 - 1 = 9 lần số bé

Vậy số bé là:

          333 : 9 = 37

Số lớn là:370(Xoá chữ số 0 ở tận cùng số lớn thì được số bé)

               Đáp số:Số bé:37

                          Số lớn:370

Các khoáng sản chính của châu Phi:

-dầu mỏ

-khí đốt

-sắt

-man - gan

-crôm

-mi –ken

-cô – ban

-đồng

-kim cương

-vàng

-chì

-uảnium

-phốt phát

Chúng phân bố chủ yếu ở phía nam và phía bắc

Today, you can find fast food restaurants in almost every big city. In some places, you.........stand ...............(1) in a line and get a hamburger or a hot dog in a paper box; ................in.......(2) others you can pick up a tray of fish, chicken, pizza.............or.............(3) even Mexican anh Chinese food; and in some fast good places you can even ...........park...............(4) your can up to a windown and place your order. A ...................few...........(5) minutes later, a worker passes you your food..............through............(6) the window and you can drive away and eat ........it..................(7) in your car.

In New York, Paris, Tokyo, Singapore and thousands of.............big............(8) cities around the world, new fast food restaurants .......often...................(9) every day. But why do people ......preper.................(10) fast food restaurants to more comfortable restaurants where they can sit quietly at a table and watch tha world go by?

Today, you can find fast food restaurants in almost every big city. In some places, you.........stand ...............(1) in a line and get a hamburger or a hot dog in a paper box; ................in.......(2) others you can pick up a tray of fish, chicken, pizza.............or.............(3) even Mexican anh Chinese food; and in some fast good places you can even ...........pork...............(4) your can up to a windown and place your order. A ...................few...........(5) minutes later, a worker passes you your food..............through............(6) the window and you can drive away and eat ........it..................(7) in your car.

In New York, Paris, Tokyo, Singapore and thousands of.............big............(8) cities around the world, new fast food restaurants .......often...................(9) every day. But why do people ......preper.................(10) fast food restaurants to more comfortable restaurants where they can sit quietly at a table and watch tha world go by?

Phân bố dân cư không đồng đều do 2 nguyên nhân chủ yếu:
- Các nhân tố tự nhiên : Khí hậu đất, nước, địa hình, khoáng sản.
- Các nhân tố kinh tế - xã hội: Trình độ phát triển sản xuất, tính chất của nền kinh tế, lịch sử khai thác lãnh thổ và sự chuyển cư.