Giải thích các bước giải:
Ta có :$1-M=1-\dfrac{4a}{a^2+4}=\dfrac{a^2+4-4a}{a^2+4}=\dfrac{(a-2)^2}{a^2+4}\ge 0\quad\forall a$
$\to M\le 1$
$\to GTLN M=1\to a=2$
....................Giúp mình với,
I was born in Newcastle, a city in the North East of England. Newcastle is on the bank of the River Tyne. It is quite big, with a population of about200,000 people. There is a cathedral and a university. There are five bridges over the River Tyne, which link Newcastle to the next town, Gateshead, where there is one of the biggest shopping centres in the world. A few years ago, the main industries wereshipbuilding and coalmining, but now the chemical and soap industries are important. I movedto London ten years ago and I often return to Newcastle. I miss the people, who are very friendly, and miss the beautiful countryside near the city, where there are so many hills and streams. 11.Newcastle is ____________. A.a city in the North of England B.a city near the North East of England C.a city in the North East of England D. a small town in England 12.The population of Newcastle is ____________. A.200,000 people B.about 200,000 people C.much less than 200,000 people D. much more than 200,000 people 13.Gateshead has one of __________in the world A.the most beautiful countryside B.the largest river C.the most important shipbuilding industries D. the biggest shopping centres 14.According to the passage, writer ________. A.doesn't live in Newcastle any more B.has come back to live in Newcastle C.is still living in Newcastle D. has never returned to Newcastle 15.Which of the following is NOT true about Newcastle A.It is next to Gateshead B.Its main industry now is shipbuilding C.It has a cathedral and a university D. Its people are friendly
VII . Using the words given to make sentences. 46. Quang / brother / walk / movie theater / moment. ______________________________________________________________ 47. Ba / usually / play volleyball / but / sometimes / sailing _____________________________________________________________ 48. The Barkers / never / camping / because / not have / tent. _____________________________________________________________ 49. Where / your parents / moment ? _____________________________________________________________ 50. There / be / house / between / tree / garage. _____________________________________________________________ VIII. Read the passage and choose the correct answer to fill in the gap. I live in a house near the sea. It is ...(51)... old house, about 100 years old and...(52)... very small. There are two bed rooms upstairs...(53)... no bathroom. The bathroom is down stairs ... (54)... the kitchen and there is a living room where there is a lovely old fire place. There is a garden….(5)…... the house. The garden...(56)... down to the beach and in spring and summer.....(57)….. flowers every where. I like alone….(58)..... my dog, Reck, but we have a lot of visiters. My city friends often stay with…..(59)….. I love my house for.... (60).... reasons the garden, the flowers in summer, the weather in fall, but the best thing is the view from my bedroom window. 51. A. a B. an C. the D. any 52. A. It's B. It C. there's D. They're 53. A. and B. or C. but D. too 54. A. between B. next C. near to D. next to 55. A. in front B. front of C. of front in D. in front of 56. A. go B. going C. goes D. in goes 57. A. there are B. they are C. there are D. those are 58. A. for B. of C. on D. with 59. A. me B. I C. my D. I'm 60. A. a B. any C. many D. a lot
I. Fill in the blanks by using the correct conjunctions: but, and, or, so. For example: She likes cooking but she doesn’t like to eat a lot. 1. I like English __________ I like French very much. 2. My brother likes maths __________ he doesn't like history. 3. The children forgot their homework, ________ the teacher was angry with them. 4. Can you read ________ write English words? 5. Are the questions right ______ wrong? 6. It's great ________ it's fun. 7. Would you like tea ________ hot chocolate for your breakfast? 8. Our car is old, _______ it drives beautifully. 9. It was very warm, _______ we all went swimming. 10. Do we have French _______ music after the break?
Bằng một bài văn ngắn, em hãy bày tỏ suy nghĩ của mình về nghĩa đồng bào, tình đồng bào được nhắc đến qua những cử chỉ của nhà nước khi có người dân ở các nước Châu Âu khi có đại dịch covid-19 hoành hành.
Giúp mink vs mink đang cần mink cảm ơn
SECTION III . READING I. Fill in each blank with ONE suitable word to complete the passage. ( 10 points) Parents and friends We can choose our friends, but we can't (1) …… our relatives. That does not mean that members of our(2) ….......… cannot also be our friends. Many children have a very (3) ……… relationship with their parents, and they see them as friends. Of course when you are a teenager, there are times(4) ……. you do not get on well (5).....................your parents or they can get angry with you. That's only natural. There are (6) …..….when you want to be independent and decide things by (7) …………. After all, nobody is perfect, and we all (8) ……. mistakes. But your parents understand that. When you grow up, you will see that you have many things in (9) ……… with your mum and dad, and you will become closer ( 10) ……. them. AI ĐÓ GIÚP MÌNH VỚI
11. Taking some medicine is good for you now. ➔ It's ________________________________________ 12. It's not good idea to go out in the rain ➔ It's better to avoid________________________________________ 13. I expect that she will give me some advise. ➔ I expect her________________________________________ 14. I remember someone giving me some money ➔ I remember being________________________________________ 15. Could you close the window? ➔ Would you mind________________________________________ 16. Are you going to the theatre next Sunday? ➔ Have you planned on________________________________________ 17. Shall we help him paint the wall? ➔ Do you consider________________________________________ 18. Would you please prepare dinner? ➔ Would you mind________________________________________ 19. why don't we buy some presents for her? ➔ He suggest________________________________________ 20. Shall we write a letter? ➔ What about________________________________________
Cho tổng s =7 + 10 +13 +...+97+100 . tính tổng s cho biểu thức A = 13 .a +19 .b +4.a - 2.b với a+b =100 Tính giá trị của biểu thức A
giúp mk câu 5,6 của bài thực hành nha
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