Mấy bn ơi giúp với ạ Tính nhanh : 45-5x 21

Chiều dài của một phân tử ADN à 8500 Ǻ. Khối lượng nucleotit của ADN đó là: A. 9.106 đvC B. 15.105 đvC C. 9.105 đvC D. 8.105 đvC

o đoạn ab=10, trên đường thẳng xy lấy c nằm trên đg thẳng xy. lấy c nằm giữa a và b lấy điểm m sao cho b là trung điểm cn. tính mn

Mng giúp e vs ạ! ĐỀ BÀI: số đối của x = 4 và x > 0 Cám ơn mng nhìu ạ. P/S: E SẼ VOTE CHO 5 SAO Ạ

Hoà tan hoàn toàn 18,6g hỗn hợp X gồm kim loại M (có hoá trị không đổi) và Al2O3 vào 450ml dd HCl 2M (vừa đủ), thu được 3,36 lít khí thoát ra (đktc) a) tính % khối lượng mỗi chất trong hỗn hợp đầu b) xác định kim loại M

Cho tam giác ABC nội tiếp đường tròn (O ; $\frac{AC}{2}$), khi đó tam giác ABC là: A. Tam giác cân B. Tam giác vuông C. Tam giác đều D. Tam giác vuông cân

Cho tam giác ABC cân tại A, góc A bằng 30 độ, BC=2cm. Trên cạnh AC lấy điểm D sao cho góc CBD = 60 độ. Tính độ dài AD.

2. Read the passage and choose the correct answer. Living in the country without a doubt sounds appealing but it is highly important to be aware that country life is very different from what you have experienced during a few-day vacation and that the countryside has changed a lot in the last few decades. So before you start packing, you are recommended to take into account both the pros and cons of country life. First of all, country life depends greatly on where you live because living in the country can mean a lot of things including living in a small village, a market town or an isolated place with the first neighbor living 10 miles away. The latter option sounds very tempting because it gives you all the privacy and peace in the world you could possibly ask for. However, living far from the "civilization" also means living far from the shops, schools, pharmacies and other things city dwellers take for granted. Many people who live in villages and market towns will say that city dwellers have more privacy and they are partly right. In the country, everyone knows everyone and everyone knows everything about everyone. People in the country are friendlier and more open but they are people. This means that they are naturally curious and that they may want to know too much about your personal stuff. But then again, people will only be as intrusive as you allow them to be. Living in the country offers a number of benefits over city dwelling but it is not as idyllic as many people think it is. You are recommended to take time and think things through before you decide to move to the country and buy an old farmhouse. Also, keep in mind that you can also buy a small cottage with a lovely wood burning stove to have a place of your own to retreat when you need a break from the city. 1. The same meaning with “pros and cons" is A. advantages and disadvantages B. truths and lies C. dos and don'ts D. facts and figures 2. What should you do before moving to live in the countryside? A. You should start packing your things. B. You should start packing only your necessary things. C. You should prepare money to buy a farmhouse. D. You should consider the pros and cons of living in the countryside. 3. "The latter option" is A. Living in the country B. Living in a small village C. Living in an isolated place D. Living in a market town 4. What sentence is NOT TRUE about living in the country? A. People in the country are friendlier and more open. B. It gives you more privacy than living in cities. C. The countryside has changed a lot in the last few decades. D. Country life is very different from life you have experienced during a few-day vacation. 5. How many cons in which living in the countryside results are said in the essay? A. 1 B. 2 C. 3 D. 4 6. According to the passage, people who need a break from the city should A. take a vacation to the country B. buy an old farmhouse C. move to the countryside to enjoy the nature and breathe fresh air D. buy a small cottage with a lovely wood burning stove. Bạn nào giúp mk vs !

giúp mình với 41. John soon rowed _____ the river and tied _____ the boat _____ the other side. 42. _____ both sides _____ the road there were rubber estates. 43. _____ the holidays I intend _____ visit many places which I have heard _____ from friends who have been to them. 44. The new dam produces electricity _____ many parts of the country. 45. I asked my mother _____ the key _____ the cupboard. 46. The car nearly knocked me _____. 47. _____ about two weeks our holidays will start. 48. I expect _____ return _____ Kuala Lumpur _____ about a week's time. 49. The bottle slipped _____ my hand. 50. _____ the last holidays I was _____ hospital. I was looked _____ _____ a nurse. 51. My front tyre was punctured _____ the way _____ school. 52. _____ Thursday everything seemed to go wrong _____ me. 53. I got up _____ seven o'clock, had my breakfast and then said goodbye _____ my parents. 54. While I was waiting _____ the bus _____ come, I saw a motorist stopped _____ the police _____ speeding. 55. We had a last look _____ every part of the island. 56. I was late _____ school because _____ the storm. 57. Coconut palms are grown _____ seed. 58. I hadn't seen my cousin _____ a long time so I stopped to chat _____ him _____ an hour or so. 59. She bought all sorts _____ things _____ the market. 60. Old coconut shells can be made _____ quite useful things. 61. I hope to go early _____ December but I must return _____ the end of the month. Joan is coming to see us _____ the first of January. 62. He doesn't like to admit that he has no hope _____ getting the job. 63. I shall probably stay with them _____ about a day or two. 64. I was thinking _____a suitable day _____ our journey _____ Hawaii. 65. Put that box _____ the corner _____ the room, please. 66. The man _____ charge _____ the team is a friend of mine. 67. He took us _____ a drive round the island. 68. She comes _____ school _____ a taxi but goes home _____ bus. 69. We shall picnic _____ the beach _____ Causeway Bay. 70. _____ the coming holidays I hope to stay _____ my uncle's house. 71. They are all under fifteen except _____ Peter whose fifteen birthday was _____ the fifth _____ last month. 72. My father is going to France _____ December the third and staying _____ a few days. 73. She tidied _____ the house in preparation _____ the visit of her relatives _____ Japan. 74. _____ ten o'clock a taxi is coming _____ us. 75. I shall stay _____ London _____ five days _____ least. 76. We went _____ chartered bus and our teacher went _____ us. 77. I go to school _____ the morning; I go home _____ the afternoon. 78. I work and play _____ the evening, and I sleep _____ night. 79. In the morning I leave my house _____ seven o'clock. I return _____ two o'clock. I go _____ bed _____ ten o'clock. 80. My parents work _____ a farm but my brother works _____ an office.

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