cho phương trình x²-2(m-1)x-3=0

tìm m để pt trên có 2 nghiệm phân biệt x₁ , x₂ thỏa mãn\(\dfrac{x_1}{x_2^2}+\dfrac{x_2}{x_1^2}=m-1\)

V. Fill in the blanks with the correct form of the words in the blankets. (1 pt)

1. Stop Minh! It’s very _________________ to be near the stove.(danger)

2. On Passover holiday, people celebrate freedom from _________________. (slave)

3. In the future, many buildings will be _________________by solar energy. (hot)

4. We can protect the environment by _________________air pollution. (reduction)

VI. Fill in each numbered blank with one suitable word from the box to complete the passage. (1 pt)

A WONDERFUL TRIP IN MOROCCO!

       I went to Morocco in March with my sister and had a fabulous time on a desert tour (1) ____________ was a fantastic experience. From Fez, we (2) ____________ to the desert with sightseeing stops along the way. We rode the camels into the desert and had dinner. It’s nice if you get there (3) ____________ sunset. In the morning, sunrise at the desert is a wonderful experience and then they serve you breakfast. We really love this trip and I (4) ____________ recommend this trip.

VII. Read the passage carefully then answer the questions. (1 pt)

       A forest fire broke out last Monday in Thuy Nguyen District’s Mot Mountain in Hai Phong Province, burning down at least three hectares of eucalyptus trees. The fire started around 2 p.m and took about an hour to put out, but more than three hectares of forest vegetation were totally damaged within that time. The district’s forest rangers said that there are many graves on the mountain and that the fire may have been caused by people who visited the forest on Tet (Lunar New Year) and burned incense, fake banknotes and paper clothes at the graveside of their loved ones.

1. Where did the forest fire break out last Monday?

       _  _________________________________________________________________________.

2. How long did it take to put out the forest fire?

       _  _________________________________________________________________________.

3. How many hectares of forest vegetation were totally damaged?

       _  _________________________________________________________________________.

4. By whom may the fire have been caused?

       _  _________________________________________________________________________.

IV. Read the passage and circle the best answer A, B, C or D to complete the passage. (1pt)              SARS (Severe Acute Respiratory Syndrome) is a deadly disease. Scientists  haven't found the

(25) ___________ of this disease. SARS is dangerous because it develops quickly. Patients normally

(26) ___________ a high fever, a sore throat, and cough. Their body temperature is above 38°C. Antibiotics cannot cure SARS, and scientists are looking for a (27) ___________to prevent the disease. Before they can find one, it is important to have a (28) ___________ lifestyle. You should keep fit, have plenty of fresh air, and eat lot foods with vitamin C.

25. A. reason                           B. cause                       C. source                                 D. ground

26. A. make                             B. take                         C. have                                    D. receive

27. A. treatment                      B. cure                         C. tablet                                   D. vaccine

28. A. healthy                         B. rich                         C. wealthy                               D. strong

V. Read the text carefully, then choose the most suitable answers (A, B, C or D) (1pt)

The elephant is the largest animal to walk on Earth. An elephant can carry a load of 1,200 pounds. They eat 300 pounds of food a day. An elephant baby can weigh 200 pounds at birth. Elephants can live up to 70 years. Elephants can be trained to carry logs with their trunks. They also use their trunks for drinking water, bathing, eating and communicating. There are two kinds of elephants: the African elephant and the Indian elephant. African elephant can be characterized as larger ears. The African elephant grows up to 10 feet and weighs as much as 12,000 pounds. The Indian elephant grows up to 9 feet tall, and weighs up to 800 pounds. This elephant is characterized as smaller ears. Another name for the Indian elephant is the Asian elephant.

29. How much does an elephant baby weigh at birth?

A. 70 pounds                B. 200 pounds              C. 300 pounds                D. 1,200 pounds

30. According to the passage, elephants can use their trunks for the following activities EXCEPT?

A. Sleeping                   B. communicating         C. Bathing                      D. Drinking

31. Which kind of elephant is the largest?

A. The Indian elephant                                       B. the African elephant

C. the Asian elephant                                         D. the Indian and Asian elephant

32. An Indian elephant has __________________ than an African elephant.

A. a longer tail              B. a shorter tail             C. bigger ears                  D. smaller ears

She left university two years ago.

It is ...........................................................

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. Having 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 bottles of oxygen; 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 the energy to take the trash away. They only 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 50,000 kilos 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.

1. What is the main topic of the passage?

2. Where do climbers put their empty oxygen bottles?

A. On the ground   B. In trash cans     C. On their back     D. In their tents

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

4.  How much trash has been left on the mountain?

A. Four hundred kilos                      B. Four thousand kilos

 C. Five thousand kilos                    D. Fifty thousand kilos

5. Why do climbers on Mount Everest carry bottles of oxygen?

6.  In line 6, the sentence: “people leave them behind”, what does the word them refer to?

A. Tents      B. Oxygen bottles              C. Strong winds     D. Other climbers

Đất nước mình bé nhỏ vậy thôi em

Nhưng làm được những điều phi thường lắm

Bởi hai tiếng nhân văn được cất vào sâu thẳm

Bởi vẫn giữ vẹn nguyên hai tiếng đồng bào.

Em thấy không? Trong nỗi nhọc nhằn, vất vả, gian lao

Khi dịch bệnh hiểm nguy đang ngày càng lan rộng

Cả đất nước mình cùng đồng hành ra trận

Trên dưới một lòng chống dịch thoát nguy.

(Trích "Đất nước ở trong tim" - Chu Ngọc Thanh)

Qua đoạn trích em cảm nhận được gì về đất nước (viết từ 3-5 câu)