Giúp em câu 27 hàm số ạ đừng làm tắt ạ

Cho hình chữ nhật ABCD, có AB = 2AD. Từ A kẻ một đường thẳng bất kỳ cắt cạnh BC và đường thẳng CD lần lượt tại M và N. Chứng minh: 4/AM2 + 1/AN2 có giá trị không đổi.

Câu 1: chứng minh rằng tài nguyên sinh vật nước ta có giá trị to lớn về phát triển kinh tế xã hội và bảo vệ môi trường Câu 2:nêu đặc điểm chung của đất vn

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C. WRITING Question 1: Mary went to Viet Nam last year and it was her second time. A. That was the first time Mary went to Viet Nam. B. That wasn’t the first time Mary went to Viet Nam. C. That was the second time Mary went to Viet Nam. D. That was the last time Mary went to Viet Nam. Question 2: There are many places worth seeing in London. A. There are many places of interest in London. B. There are not many places of interest in London. C. There are no places of interest in London. D. There are many places which interesting in London. Question 3: I want to visit a beautiful beach in Viet Nam. Could you suggest one? A. Do you mind if you suggested one beautiful beach in Viet Nam? B. Would you mind if you suggest one beautiful beach in Viet Nam? C. Do you mind suggesting one beautiful beach in Viet Nam? D. Could you suggested one beautiful beach in Viet Nam? Question 4: Could you help me to send this letter to my boss? A. Would you mind sending this letter to my boss? B. Do you mind send this letter to my boss? C. Would you mind send this letter to my boss? D. Would you mind to send this letter to my boss? Question 5: Yesterday we decided to paddle around West Lake in a canoe. A. We decided to go around West Lake in, a canoe yesterday. B. We decided to walk around West Lake in a canoe yesterday. C. We decided to run around West Lake in a canoe yesterday. D. We decided to ride around West Lake in a canoe yesterday. Question 6: Next year, we _________ and get jobs. A. will graduate B. will be graduate C. will graduating Question 7: I hope pollution _________ worse next year. A. will not be B. won't be C. A and B are correct. Question 8: _________ to Australia on your summer vacation next year? A. You will go B. Will you go C. Will you be go Question 9: Sky safety system _________ everyone from crashing. A. will do stop B. will stop C. will be stop Question 10: _________ use my jetpack to fly anywhere easily. A. I'll B. I will C. A and B are correct. Question 11: What problems do you think future transport _________? A. will have B. have will C. do have Question 12: I'm afraid I _________ part in your party this weekend. A. not will take B. won't take C. will not be take Question 8: I'm not sure I _________ travelling by hot-air balloon again or not. A. will trying B. will be C. will try Bài 3. Decide whether the following sentences are Correct or Incorrect in terms of grammar. Question 1: Is this yours bicycle or hers? A. Correct B. Incorrect Question 2: They won't come to the stadium by their car. A. Correct B. Incorrect

Bài 3: Cho tam giác ABC nhọn, đường cao BD và CE. Trên cạnh BD lấy M sao cho góc AMC = 900, trên cạnh CE lấy điểm N sao cho góc ANB = 900. Chứng minh tam giác AMN cân.

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B. READING Part 1: Read the passage and do exercises below: To stay healthy, we should have a balanced diet, do morning exercises and have good medical care. However, people get more diseases because they live in the polluted environment. So to protect the environment from pollution, first we should reduce smoke from the factories. Second, we can make our environment clean by collecting garbage, planting tree. Finally, we should make our ocean clean. I/ Write True (T) False (F): 1/ ………We have to protect the environment. 2/……….We shouldn’t plant the tree. 3/………..We should reduce smoke from the factories. 4/………..We shouldn’t make the ocean clean. 5/………..We have to do morning exercises. 6/………..We shouldn’t have a balanced diet. Part 2: Choose the words or phrases that best fit each of the blank spaces Andrew studies (1) __________ around the world. He likes mountain-climbing. He will go to Sa Pa. Mary loves Vietnam and she wants to travel (2) ________ train to see as much of the country as possible. She also wants to visit and oceanic institute in Vietnam. She will go Nha Trang. John is (3) __________ in the history of Vietnam. He wants to visit the place where President Ho Chi Minh (4) _________ Vietnam in 1911. He will go to Nha Rong Harbor. Joanne likes swimming and (5) __________. 1.A. cloth B. tribes C. compost 2. A. on B. of C. by 3. A. interest B. interesting C. interested 4. A. to leave B. leaves C. left 5. A. sunbathing B. sunbathe C. Sunbathed Part 3: Read the text then choose the best option to answer the questions. I live in a house in the country near the sea. It’s an old house, about 100 years old, and it’s very small. There are two bedrooms upstairs but no bathroom. The bathroom is downstairs next to the kitchen and there’s a living room where there is a lovely old fireplace. There’s a garden in front of the house. The garden goes down to the beach and in spring and summer there are flowers everywhere. So, I have a lot of visitors. My city friends often stay with me. I love my house for many reasons: the garden, the flowers in summer, the fire in winter, but the best thing is the view from my bedroom window. 1. Where does the author live? A. near the sea B. in the country C. A & B 2. How many rooms are there in his/ her house? A. two B. three C. four 3. There’s a garden _________ the house. A. in front of B. behind C. beside 4. The author loves the house because of ____. A. the garden B. many reasons C. the fire in winter 5. What does the author like best?_____ A. the lovely old fireplace B. the garden C. the view from his/ her

III. Choose the best item among A, B, C or D to complete the sentences: 1. _________ is the most expensive city in the world? – I think it's Tokyo. A. What B. where C. when D. how 2. _________ is your favorite tennis player? – I don't like tennis. A. Where B. Who C. How often D. How long 3. My brother can't swim _________ he's afraid (sợ) __________ water. A. because - of B. and - about C. but - of D. so - to 4. My sister likes going to the cinema _________ I like watching TV at home. A. and B. but C. because D. or 5. ___________ pen is this? Can I borrow it? A. Whose B. Whom C. Who D. Which 6. ___________ are you going to invite to your party next week? A. What B. Who C. Whose D. Where 7. ___________ did you spend in Hanoi? – One week. A. How many B. How much C. How long D. How often 8. ___________ is a person who reads a report in the program. A. A weatherman B. a comedian C. a newsreader D. a guest 9. We use a __________ to change the channels from a distance. A. remote control B. TV schedule C. newspaper D. volume button 10. I want to watch the cartoon _________ I turn on the TV. A. but B. so C. although D. because 11. Jerry is a clever little mouse. A. small B. special C. intelligent D. special 12. 'Let's learn' teaches children to study Maths. It's an __________ program. A. live B. popular C. entertaining D. educational 13. _________ Mai and Lan are interested in listening to music. A. because B. both C. neither D. so 14. The book is __________ the adventure of three close friends. A. on B. from C. at D. about 15. They invite special _____________ to appear in the show. A. character B. guests C. foxes D. audiences. 16. Millions of children _________ the world enjoys the show. A. all B. in C. around C. over 17. The game show this week will test you general __________ about Amazon jungle. A. schedule B. knowledge C. fact D. adventure 18. The program can both _________ and entertain young audiences. A. educated B. education C. educational D. educate 19. The ___________ I like best is Xuan Bac. A. comedy B. comedian C. fun D. funny 20. Where are the children? They __________ in the yard. A. play B. are playing C. is playing D. plays

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