Đốt cháy hoàn toàn một thể tích khí thiên nhiên gồm metan, etan, propan bằng oxi không khí (trong không khí, oxi chiếm 20% thể tích), thu được 7,84 lít khí CO2 (ở đktc) và 9,9 gam nước. Thể tích không khí (ở đktc) nhỏ nhất cần dùng để đốt cháy hoàn toàn lượng khí thiên nhiên trên là :

Năm ngoái Hai tổ làm được 700 sản phẩm .Năm nay tổ 1 vượt 20%, tổ 2 vượt 15% nên Hai tổ làm được 830 sản phẩm .Hỏi năm ngoái, Mỗi tổ làm được bao nhiêu sản phẩm?

Các bạn gợi ý giúp mình hay có bài tham khảo để viết bài luận về chủ đề môi trường rác thải nhựa

Tìm GTNN của biểu thức x^2+4xy+5y^2+2x+3y+10

Giúp mình bài 22 với cảm ơn các bạn nhiều

He offered lend/ to lend me this book The next stage of the revolution/development of TV is the interactive TV Is this ......... from easy to complete (APPLY) They have changed the tradition Ao dai a lot since then. => Laura hasn't written to her mother for a month. => He regrets telling the truth => I haven't enjoy myself in ages => It's ages since I asked the hotel porter to wake me at 8 o'clock the following morning => "Please

Bằng phương pháp hoá học, hãy nhận biết các hỗn hợp sau : (Fe + Fe2O3), (Fe + FeO), (FeO + Fe2O3)

Làm hộ mk cậu c nha Khó quá mk ko làm được

II. Supply the right form of verb in the bracket 1.You always (watch) …. television. You should do something more active. 2.When I entered his room, I saw him (sleep)........................in a chair. 3. Mary and John are neighbors. They ( know).......... each other for a long time. 4.Her daughter is old enough (stay)............................at home alone. 5. One hudred dollars (be)...................................an big amount of money for her. 6.She can’t answer the phone because she (take).......... a bath. 7.Can you give Tim this message when he (come)……………. here tomorrow? 8.Hurry up or you (be) …………………….. late for school, Hoa. 9.During my vacation in Nha Trang, I (take)………………. a lot of photos. 10.You will get used to (eat)……………… with chopsticks soon, John. 11.Why……….. you (not go)……. to the party last night, Ba? 12.None of my classmates (be) ……………… good at table tennis. III. Give the correct form of the words in brackets (10 ps) 1.This restaurant is .............for its Western meals ( fame). 2.Some young people nowadays want to have a strange .................(appear). 3.How ....................of you to break the cup ( care). 4.Rubber is elastics, so we can ......................this string (long). 5.He grew ........................after waiting for a long time . ( patience) 6.The Sword Lake is one of the......................places in HaNoi (history). 7.His speedy...............after the operation amazed all the doctors. (revive) 8.She is one of the .......................from friends of the Earth( represent) 9.A ...........person is the one who is kind (think). 10.The knife may need ........................before it is used. ( sharp). IV. Fill in the blank with a suitable preposition 1........the daytime the streets are crowded but .........night they are quite deserted. 2. We’re having a party ..................New year’s Eve. Can you come? 3. He escaped from the prison ................a car. 4.My brother has been in the army ................1998. 5. There are bikes, motorbikes and cars coming ………. every direction. 6. A recent survey ………….teenagers in the USA had some surprising results. 7.After their visit to the aquarium, the Robinsons went to a food stall ……….lunch. 8.That boy is better …………. History than I am. 9. Hoa set the table …….. plates, bowls, chopsticks, spoons and glasses. 10.This apartment is suitable………….my family.

Mọi người giúp mình phần b với ạ