Cho hàm số y=-x^3+4x^2+1cos đồ thị hàm số là (C)và điểm M(m;1). Gọi S là tập hợp tất cả các giá trị thực của m để qua M kẻ được đúng hai tếp tuyến đến đồ thị C . Tổng giá trị các phần tử của S
1. Cho đề văn sau: - Ăn quả nhớ kẻ trồng cây b. Xác định luận điểm, luận cứ của từng đề.
Xin hãy giúp em làm câu 2 với câu 4 phần trên cùng. Câu 2 và câu 3 phần B. Em không biết làm mấy câu này mà em cần nộp bài trước 12 giờ. Làm ơn giúp em nhé.
1. A. although B. southern C. theater D. these 2. A. stopped B. missed C. looked D. needed 3. A. airports B. suitcases C. things D. calculators 4 A. service B. practice C. advice D. wide 5. A. locate B. situate C. pagoda D. landscape 1. 2. 3. 4. 5. II. Give the correct tense of the verbs in brackets. 6. Last night I (walk) ______ along the street when I suddenly heard foodsteps behind me. 7. My father (do) ______ morning exercise every morning. 8. (they /just / receive) ______ an email from their close friend? 9. Look at that girl! She (wear) ______ a beautiful red dress which I like. 10. Lan (buy) ______ a new bike next month. 6. 7. 8. 9. 10. III. Choose the correct answer. 11. The boy______ by the window is very intelligent. A. sitting B. is sitting C. sits D. are sitting 12. We have ______ ways of learning a foreign language. A. different B. difference C. differently D. differenty 13. I went to school as usual yesterday ______ I had a bad cold. A. but B. although C. so D. because 14. Nam said that he ______ to school then. A. is going B. was going C. went D. goes 15. This kind of chocolate tastes delicious, ______? A. does it B. doesn’t it C. isn’t it D. is it 16. Nam was born in Vietnam. Vietnamese is his ______ language. A. first B. second C. mother D. third 17. My grandmother used ______ after my uncle and my aunt. A. look B. to look C. looking D. looked 18. He is tired ______ he stayed up too late to watch TV lastnight. A. so B. because C. but D. and 19. Where ______ you go if you have a car? A. would B. have C. did D. will 20. He is the man ______ helped me yesterday. A. which B. who C. whom C. whose 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. IV. There is a mistake in the 4 underlined part of each sentence. Find the mistakes and correct them. 21. Mathematics has been my difficult most subject so far this year. A B C D 22. We’d better hurry, or the train might leaves without us. A B C D 23. If we go on to litter, the environment will become seriously polluted. A B C D 24. I was amazing that he was interested in our plan. A B C D 25. Lan said she would go to her hometown next summer. A B C D 21. 22. 23. 24. 25. V. Choose the word (A,B,C or D) that best fits the blank space in the following passage. Today, computer companies sell many different programs for computers. First, there are programs for doing math problems. (26)_________, there are programs for scientific studies. Third, some programs are like fancy typewriters. They are often used by writers and business people. Other (27)_________are made for courses in schools and universities. And finally, there are programs for fun. They include word games and puzzles (28) _________ for children and adults. There are many wonderful new computer programs, but there are other reasons to like (29) _________ . Some people like the way computers hum and sing when they (30) _________ . It is a happy sound, like the sounds of toy and childhood. Computers also have lights and pretty pictures. And computers (31) even seem to have personalities. That may sound strange, but computers seem to have feelings. (32) _________ they seem happy, sometimes they seem angry. It is easy (33) _________ they are like people. 26. A. Two B. Second C. Twice D. Double 27. A. programs B. people C. students D. typewriters 28. A. to B. with C. for D. of 29. A. programs B. reasons C. games D. computers 30. A. work B. have worked C. are working D. worked 31. A. even B event C. so D. because 32. A. Sometime B. Sometimes C. No D. Often 33. A. to think B. thinking C. for thinking D. that thought
Giúp mik bài 16 nhé cả bài 15 nữa nhé
cho goc xoy co oz la tia phan giac, mot diem M thuoc tia oz tu diem M ke MH va MK lan luot vuong goc voi hai canh OX va OY ( H thuoc OX, K thuoc OY). chung minh OH = OK. goi I la giao diem tia OZ voi HK, chung minh IH=IK, OZ vuong goc voi HK
Cầu cao nhân giúp mk, hứa vote 5*
Choose the best option to complete each sentence . Circle A,B orC 1.Tomorrow is my parent 's wedding........ A. festivity B. celebration C. anniversary 2. A..... running under sea connects England and France A. flyover B. tunnel C. underpass 3. The school 's .... have been improved with a new lab, a new gym and dining room A. exhibition B. privacy C. facilities 4. My wife is a very.... ; she understands and cares about others' problems A.tolerant B. considerate C. sympathetic 5. In a culture, folktales are often ways to pass down...... memory from one generation to the next. A. collective B. Cooperative C. Combined
Mot hinh tam giac co do dai day laf 24cm , chieu cao bang do dai day. Tinh dien tich hinh tam giac do
Mọi người giúp mình phần tự luận với,mình đang cần gấp.
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