Câu 1: Dựa vào kiến thức đã học bài 17: LỚP VỎ KHÍ. Em hãy tóm tắt kiến thức bằng sơ đồ tư duy. Câu 2: Tầng ô dôn là gì? Tại sao phải bảo vệ tầng ô dôn? Nguyên nhân nào làm cho tầng ô dôn bị thủng?

Đốt cháy hoàn toàn $1,93$ gam hỗn hợp gồm $C_2H_3COOC_2H_5$, $CH_2=C(CH_3)-COOH$, $CH_3COOC_2H_3$ và $CH_2=C(CH_3)-COOCH_3$ rồi hấp thụ toàn bộ sản phẩm cháy vào dung dịch $Ca(OH)_2$ dư. Sau khi phản ứng kết thúc thu được kết tủa và dung dịch $X$, dung dịch $X$ có khối lượng giảm $3,97$ gam so với khối lượng của dung dịch $Ca(OH)_2$ ban đầu. Tính thể tích hơi của sản phẩm cháy ở $0^o$ $C$ và $1atm.$

làm giúp với ạ .cảm ơn tăng 60 điểm luôn

VIẾT LẠI CÂU 1. Finding an apartment in a big city is not easy. -> It is ..................................................................................................................................... 2. Shall I make you a cup of coffee? Do you ………………………………………………………… 3. Where were you born? What is ………………………………………………………… 4.Hoang will be eighteen next month. It will be ………………………………………………………… 5. It takes me two hours to get to Hanoi by motorbike. I spend ………………………………………………………… 6. My house is smaller than his one. His house ……………………………………………………… 7 .She is able to speak English to her teacher. She can …………………………………………………………

Gọi S là tập các giá trị của m để bất phương trình x^2 - 2mx + 5m - 8 ≤ 0 có tập nghiệm là [ a;b] sao cho b - a =4. Tổng tất cả các phần tử của S là?

tìm giá trị của biểu thức này cos(90-a) + sin(90-a) - cos(90+a) -sin(90 + a)

I. Rewrite the following sentences so that their meaning stays the same, using the word given for each. 1. A train leaves for Lao Cai at 5 o’clock every morning. (there) 2. The distance from Ho Chi Minh City to Phu Quoc Island is about 300km. (it) 3. Is it possible to travel to Sa Pa by air? (can) 4. Be careful or you’ll fall off your bicycle. (if) 5. Our teacher is always a careful driver. (drives) 6. Mr Tam went to work by car some years ago, but now he cycles. (used) 7. Road users should obey traffic rules strictly. (obeyed) 8. My mother washed clothes by hand in the past, but she no longer does it now. (uesd) II. Rewrite the following sentences in such a way that they mean the same as the original sentences. (2) 1. It’s a good idea to eat a lot of fruit and vegetables every day. We should 2. We couldn’t keep on cleaning the streets because of the heavy rain. Because it 3. The garden party won’t take place if the weather doesn’t improve. Unless 4. Both students and teachers can borrow books from library. The library lend 5. Nobody plays this piece of music as beautifully as he does. He plays this 6. In spite of having to work the next day, Tom watched films on DVD till midnight. Even though 7. The ending of the film was quite disappointing. We 8. Although she performed well, she didn’t receive good comments from critics. Despite her

Tìm các số nguyên x sao cho: a, -7 là bội của x+8 b, x-2 là ước của 3x-13

Help me!!! Help me!!! Hlp mE III. Viết lại câu không thay đổi nghĩa: 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........................................................................................................................

Giải phương trình sau: 12/8-x^3 = 1 + 1/x+2