Cho tam giác ABC cân tại A, vẽ AH vuông góc BC tại H biết AB=10cm, BH=6cm
a. Tính AH

b. tam giác ABH = tam giác ACH

c. trên cạnh BA lấy điểm D, CA lấy điểm E sao cho BD=CE. CHứng minh tam giác HDE cân

d. Chứng minh AH là đường trung trực cuả đoạn thẳng DE

 Cho tam giác ABC có AB = AC = 5 cm; BC = 8 cm. Kẻ AH vuông góc BC (H thuộc BC)

a) Chứng minh HB = HC và góc BAH = góc CAH

b) Tính độ dài AH.

c) Kẻ HD vuông góc AB (D thuộc AB); HE vuông góc AC (E thuộc AC). Chứng minh rằng: tam giác HDE cân.

Cho tam gíac ABC cân tại  A. Kẽ  AI vuông góc BC, I thuộc BC

a. CMR I là trung điểm BC

b) Lấy điểm  E thuộc AB  và điểm F thuộc AC sao cho AE = AF. Chứng minh rằng: tam giác IEF là tam giác cân.

c. CMR tam giác EBI = tam giác FCI

II. Đọc kỹ đoạn văn  sau và chọn đáp án đúng cho mỗi câu

    Mount Everest is the highest mountain in the world. It is also the highest trash pile in the world. About 400 people try to reach the top every year. This many climbers means a lot of trash.    It is very dangerous to climb Mt. Everest. The air is very thin and cold. Most people carry oxygen bottles; they could die without it. When the oxygen bottles are empty, people throw them on the ground. When strong winds rip their tents, people leave them behind. They don’t have enough energy to go down the mountain safely. Trash is a terrible problem. Since people first began to climb Mt. Everest, they have left 50,000kilos of trash on the mountain.Several groups have climbed the mountain just to pick up the trash. When people plan to climb the mountain, they have to plan to take away their trash.

Câu 1. What is the main topic of the passage?

Câu 2. Where do climbers put their empty oxygen bottles?

Câu 3. Why do climbers leave their trash on the mountain?

Câu 4. Why do climbers on Mt. Everest carry bottle of oxygen?

Câu 5. In line 5, people leave them behind, what does the word them refer to?

I. Điền một từ thích hợp vào mỗi chỗ trống trong đoạn văn sau.

My name is Nam. Last weekend, I visited the countryside (1) ……………… my classmates. The place is not very far (2) ……………… our town. We came there by bus – a journey of two hours. On arriving there, we (3) ……………… straight to our friend’s house. His name is Song. (4) ……………… parents are farmers. We drank coconut milk and (5)……………… a lot of country pancakes. (6) ……………… that we flew kites in a paddy then we went (7) ………………   in the river near Song’s house. We played games together. Late in the afternoon, we (8) ……………… the countryside for the town. We reached (9) ……………… at about 6 p.m. We really had a lot of fun. For me, the country side is wonderful. It has (10) ……………… beautiful and interesting places than the town.

V. Điền một giới từ thích hợp vào mỗi chỗ trống trong các câu sau.

a. I usually get up early, but on Sundays I stay in bed (1) ……………… 8 o’clock.

b. I am going to school (2) ……………… my new bicycle - a gift (3) ……… my parents.

c. It is very difficult to find a book (4) ……………… the title.

d.  (5) …Paris, Hanoi is a buzy and modren city. Are you keen (6) ………seeing Paris on TV?

e. Jenny’s new skirt is white (7) ……………… red and yellow flowers (8) ……………… it.

f. Please write (9) ……………… me and tell me (10) ……………… you family.

Gap moi nguoi oi!

1) Many people began to wearing jeans because they were cheap.
=> Because of……..
2 ) Since he was careless, Tom lost the game.
=> Because of……..