trong một tế bào chứa 2 gen có chiều dài bằng nhau số liên kết hiđrô của hen thứ nhất nhiều hơn số liên kết hiđrô của gen thứ 2 là 160 khi tế bào chưa 2 gen trên nguyên phân 4 lần liên tiếp thì môi trường ã cung cấp cho gen thứ nhất 3000 Nu loại A và cho gen thứ 2 6750 Nu loại G. Xác định 1) số Nu mỗi loại của mỗi gen 2)chiều dài của mỗi gen . 3) số chu kỳ xoắn và số liên kết hiđrô của mỗi gen (Làm cách khác trên mạng)

mọi người giúp mình vs. Mk sẽ vote 5* cho ạ!!!!!!!!!!

Cho tam giác ABC cân tại A. Từ một điểm E bất kì trên cạnh AB, kẻ một đường thẳng song song với đáy BC, nó cắt AC tại F. C/m: BE > $\frac{1}{2}$ (BC - EF)

Một hình chữ nhật có chu vi gấp 8 lần chiều rộng.hỏi chiều rộng bằng mấy phần chiều dài?

Choose the word whose STRESS pattern is different from that of the others recycle repeat reuse solar

vẽ mây ik ạ phác họa thêm cái mắt nha

Thực hiện phép tính: a) (3x+1)^3 b) (x/3-1)^3 c) (-y^2+3x)^3 d) (x/y - 2y/x) ^3 Giúp vs

Giúp e với ẹ ( thì Passive voice ạ) các cao nhân rảnh thì ghi phân tích từng cái giúp e ạ.Cảm ơn trc ạ

I have often thought about moving from my country town to a big city like London. Life in a country town is quiet and I’ve always found the bright lights and crowded streets of a city very exciting. However, after a recent visit to London to do some Christmas shopping and see the Christmas lights, I was very happy to get back home! There are more people in London than ever before! It was crowded everywhere I went. The streets, the pavements, the shops, the cafés and the Underground. Everyone was trying to get somewhere quickly. I travelled to London by train and the train was so full that I had to stand for the whole journey. Then I wanted to go on the Underground. That was a big mistake! There were hundreds of people on the platform and when the train arrived it was full! But the people on the platform just pushed and pushed and got into the train! I didn’t. I went back into the street and walked to Oxford Street. It was raining and freezing cold but it was better than the crowded Underground. After an expensive coffee I did my shopping. Well, I tried to do my shopping. There were so many people on the pavements I had to walk in the road and everyone was in a hurry. They were pushing and knocking each other with their bags. No one talked or smiled. Then, of course, it was time to go home! My feet were hurting and it was raining again so I decided not to walk. I got a taxi but it took forty-five minutes because there was so much traffic. I can’t remember the train journey home. I slept. Now I know why I live in the country. Life may not be as exciting or as fast as in the city, but there’s more room on our buses and in our shops, and the people talk to you. But the Christmas lights in London were beautiful! 1​. The writer lives in the country. ​A. True B. False C. Doesn’t say 2​. The writer lives an hour away from London. ​A. True B. False C. Doesn’t say 3​. The place she lives in isn’t very quiet. ​A. True B. False C. Doesn’t say 4​. She went to London a short time ago. ​A. True B. False C. Doesn’t say 5​. She travelled on an Underground train. ​A. True B. False C. Doesn’t say 6​. She bought a lot of things. ​A. True B. False C. Doesn’t say 7​. It was busy in London. ​A. True B. False C. Doesn’t say 8​. The people in London were very friendly. ​A. True B. False C. Doesn’t say 9​. Her cup of coffee was cheap. ​A. True B. False C. Doesn’t say 10​. She liked the Christmas lights. ​A. True B. False C. Doesn’t say

CMR: nếu 1 + $2^{n}$ + $4^{n}$ là số nguyên tố thì n phải là một lũy thừa của 3.