giải dùm mình bài 1đi mấy bạn hết cái dạng 1 luôn nha

1.Hoà tan hoàn toàn 26,4g hỗn hợp gồm M và muối cácbonat của nó (biết M thuộc nhóm IIA) vào dd HCl vừa đủ, thu được 13,44l hỗn hợp khí và khối lượng dd sâu phản ứng tăng 16,8g a. Tính tỉ khối của hỗn hợp khí so với metan b. Xác định M

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 !