Giúp mình làm phần 2 câu 1, câu 3 và câu 4 phần a. Mik cảm ơn.

Cho `x , y` là các số thực dương . Chứng minh rằng : `(x^4 + y^4)/((x + y)^4) + (√xy)/(x + y) ≥ 5/8`

Mọi người ơi giúp em câu này với ạ

I- Choose the words that has the underline pronounced differently from the others. (5pts) 1. A. looked B. watched C. carried D. stopped 2. A. study B. success C. surprise D. sugar 3. A. unite B. underline C. university D. uniform 4. A. danger B. angry C. language D. passage 5. A. character B. children C. teacher D. change II- Choose the word that has the stress pattern is different from the others. (5pts) 1. A. realize B. improve C. possible D. comfortable 2. A. important B. especially C. prefer D. influence 3. A. general B. opinion C. abroad D. surprise 4. A. comfort B. nation C. apply D. moment 5. A. medical B. advise C. vegetables D. physical

đảo ngữ: She was so frightened that she couldn't say anything

giúp vs ạ II. Choose the best answer. 11.My mother hasn’t worn Ao Dai _____ at least ten years. A. in B. on C.for D.since 12.I wish you ________ do the house work tomorrow. A. didn’t have to B.wouldn’t have to C. don’t have to D.hadn’t to 13.____ have fashion designers done to modernize the Ao Dai ? A. How enient B. What C. Why D. Where 14.Nguyen Du is considered a famous Vietnamese _______. A .poetry B. poem C. poet D.poetic 15.It’s ____ to call anyone at night A .beautiful B. traditional C. casual D.inconvenient 16.The Ao Dai is the ___ dress of Vietnamese women. A .convenient B. baggy C. traditional D. modern 17.How many cups off coffee ___ today ? A .are drunk B. have been drunk C.were drunk D. drank 18.When was the last time you ___ to the zoo? A .went B. going C. be D. being 19.The traditional Ao Dai used ____ by both men and women. A .to being worn B. to wear C.to have worn D.to be worn 20.This is my favorite short ____ blouse. A .sleeved B. sleeve C. sleeving D. sleeves III Give the correct form of the verbs. 21.Some of these traditional dresses have been _______ . MODERN 22The government has made an important ______for the unemployed. DECIDE 23______________ jeans are 1960’s fashion. EMBROIDER 24.Jean made in China are sometimes ___________cheap. SURPRISE 25.They have __________ in finding a suitable apartment. DIFFICULT 26.Some young people today have a very strange __________ . APPEAR 27.Many designers took _________ from Vietnam’s ethnic minorities . INSPIRE 28.She was ____when she did the English test badly HOPE 29.He didn’t give any _________for his absence . EXPLAIN 30.They have just ___________ a new style of Jeans in the USA . INTRODUCTION IV Find a mistake and correct it. 31.Jean cloth is very trong and it doesn’t wear out easy. A B C D 32. My father has given up smoking for last year. A B C D 33. Daisy used to going dancing five times a week when she was young. A B C D 34. I’d rather we have more time to work together. A B C D 35.My brother has written two books when he lost his job. A B C D 36. What do you usually wear in the weekend ? Jeans and colorful T-shirt. A B C D 37. In the 1990’s the world wide economical situation got worse, the salte of jean stopped growing. A B C D 38. Wearing uniforms helps students to feeling equal in many ways. A B C D 39. Nam and his family went to a trip to their home town for two days . A B C D 40. On conclusion, secondary school students should wear casual clothers when they are at school. A B C D IV. Give the correct form of the verbs. 41. During the last two years I ( complete )………three English courses. 42. When I first moved here , I ( not – know ) ………….many people. 43. You must tell me what you ( do ) …….since I ( leave )……….. 44. He ( water )………. the flowers in the garden when I came. 45. Why you ( look ) ………at me like that ? Did I say anything wrong ? 46.How about (see) ……………. a movie on Sunday evening ? 47.Nam didn’t use (play) ……………………. football in the afternoon. Now he often does it. 48..Nam (learn) have learn English for 8 years. 49. Do more exercise and you (feel )…….. fitter and healthier. 50. By this time next Saturday , Mr Ba ( take ) …the driving test. VII. Prepositions.. 51.Her parents were proud…………..her when she got the scholarship. 52.This suit is different ……………..the one I saw yesterday. 53.The passage is written……………English. 54.Vietnamese women usually wear Ao dai, sometimes at work and……….special occasions. 55.They named their daughter……………….their favorite singers. 56.Famous designers often make their own styles……….clothes with their own labels on them. 57.Sales of jearns went…………and the shop keepers got a lot of money. 58.Jane will come back………… June2015. 59.We are responsible ………..protecting the environment. . 60.I have known her……….ages.

giúp em làm vs ạaaa rút gọn pt thoii

Cho biết $\int\limits^1_0 {f(x)} \, dx$ = 2 $\int\limits^1_0 {g(x)} \, dx$ = -3 . Giá trị của $\int\limits^1_0 {[2f(x)+g(x)]} \, dx$ là A:-1 B:2 C:1 D:-3

Làm sao để nhận biết cạnh đáy,tam giác Thường thì có bao nhiêu cạnh đấy

Giúp mình giải câu 1/2 🙏🙏🙏🙏🙏🙏🙏🙏🙏 mình đang cần