Hãy tính hóa trị của N trong các hợp chất sau : N2O,,NO,NO2,N2O3,NH3

II. Rewrite the following sentence without changing their meaning. Ex: They were married five years ago. −>They have been married for five years. 1. This is the first time he went abroad. He hasn’t 2. She started driving 1 month ago. She has 3. We began eating when it started to rain. We have 4. I last had my hair cut when I left her. I haven’t 5. The last time she kissed me was 5 months ago. She hasn’t 6. It is a long time since we last met. We haven’t 7. When did you have it? How long 8. This is the first time I had such a delicious meal. I haven’t 9. I haven’t seen him for 8 days. The last 10. I haven’t taken a bath since Monday. It is

Fell. Brought. Broke. Sat. Swam. Got. Wrote. Took. Flew. Made. Ate. Saw

giải giúp e câu hình này với ạ : <

giải các phương trình sau: $3^{2}$-17x+24 = $\sqrt[]{x-3}$ +3$\sqrt[]{5-x}$

Exercise 4: Hoàn thành đoạn hội thoại sau với các từ đã cho: twice after cooking often late are Adam: What (10)……… you doing, Susan? Susan: I’m (11) …………… dinner. Adam: Do you like cooking? Susan: Yes, I do. I usually cook (12) ………….. school because my mother always comes home (13) ………... I help my mother with shopping too. Adam: How (14) ……………. do you go shopping? Susan: (15) ……………. a week.

I. Make questions for the underlined part in each sentence. 1.London is on the River Thames. @ …………………………………………………………………………………… 2.The Eiffel Tower first opened on 6th May 1889. @ …………………………………………………………………………………… 3.We are going to visit the Empire State Building tomorrow. @ …………………………………………………………………………………… 4.I went to London in my last vacation. @ …………………………………………………………………………………… 5.The weather in London was very cloudy and wind. @ ……………………………………………………………………………………

Một hình chữ nhật có chiều dài gấp rưỡi chiều rộng và chu vi bằng 180m. Hỏi sau khi kéo chiều dài thêm 5m, phải kéo chiều rộng thêm bao nhiêu mét để được một hình vuông ?

mong mọi ngs giúp đỡ mk đg cần gấp mk sắp phải nộp r

1)x^2 + 3y^2 + 2z^2 - 2x + 12y + 4z + 15 = 0 (Tìm X nha anh chị em)