1. Thể tích của một miếng sắt là 2dm^3. Tính lực đẩy Acsimet tác dụng lên miếng sắt khi nó chìm trong nước, trong rượu. Biết trọng lượng riêng của nước và rượu lần lượt là 10000 N/m^3 và 800N/m^3. 2. Một vật có khối lượng 810g và khối lượng riêng 2700 kg/m^3 được thả vào một chậu nước (10000 N/m^3). Tính lực đẩy Acsimet tác dụng lên vật.

Ai help mik giải câu 1 này với mai nộp r mà mãi ko bik lm ;-;

Complete each sentence with an appropriate word. The first letter of each word is given. 1. The fish have died because the river water is heavily p________. 2. Health e________ from air pollution include lung cancer, and respiratory diseases. 3. Acid rain causes serious d________ to plants and trees. 4. If the air wasn’t dirty, Nick w________ sneeze so much. 5. The main gases that l________ to acid rain are sulfur dioxide and nitrogen dioxide. 6. There is a danger of serious contamination from radioactive w________.​ 7. Hundreds of d________ fish were found floating in the river near the factory. 8. U________ sewage can spread disease and contaminate drinking water sources.

III. Choose the best answer to complete the following sentences. 1.When people finish a postgraduate course, they can get a ____________. A. baccalaureate’s degree B. bachelor’s degree C. master’s degree D. doctorate 2. __________________ means education at a university or college. A. Higher education B. Futher education C. Primary Education D. Secondary education 3._______________ skills help us analyze a problem scientifically. A. Academic B. Vocational C. Analytical D. Practical 4.Jonathan ___________ in God since he was a child A. believed B. has believed C. has been believing D. have been believing 5. I ___________ the book, you can have it back A. has been reading B. have been reading C. have read D. reading

5 sao câu trả lời hay nhất cảm ơn

hai vòi nước cùng chảy vào một bể không có nước 4 giờ 48 phút thì đầy bể. Nếu mở vòi thứ nhất trong 3 giờ vòi thứ 2 trong 4 giờ thì được 3/4 bể nước. Hỏi mỗi vòi chảy một mình thì bao lâu mới đầy bể

Tính nhanh(nếu có thể) a) 29 + 140 + 71 b) 17.2016+2016.83 c) 7^5 : 7^3 – 343 : 7 d) {2^3.40-[95-(8-3)^2]}:5 e)5^6:5^4-2.3^2 f) 120-[127-( 6-3^3)]

Ai vẽ đc Tạ doãn công tử và Nguỵ Công tử trong cùng 1 bức.Viết lên tranh chữ BJYX để cm ko chép mạng.

BÀI 1 16/ The children are busy (collect) _________ shells on the beach. 17/ The teacher promised (help) _________ us (prepare) _________ for the examination. 18/ We regret (say) _________ that the lecture was dull and wasn’t worth (listen) _________ to. 19/ There’s no (deny) _________ that he enjoys (listen) _________ to his own voice. 20/ Is (boil) _________ or (fry) _________ the best way of (cook) _________ this fish ? 21/ It’s no use your (ask) _________ him (lend) _________ you any money. 22/ Can you manage(finish) _______ (write) ______ these reports by yourself ? 23/ He advised me( consider) _____ all the facts before (decide) _____ (accept) _____ the job. 24/ They refused (allow) _____ us (go) _____ in without (sign) ______ the book. 25/ My uncle used to (show) _________ me where (go) _________ and what (buy) ________. 26/ There’s nothing like (walk) _________ as a means of (keep) _________ fit. 27/ Your doctor advised (go) ____ to bed early, so I really can’t understand your (want) ____ (stay) ____up late. 28/ We considered (give) ____her a dress for her birthday, but couldn’t help (buy) _____her some flowers, too. 20/ Would you mind (keep) ______ quiet for a moment ? I’m trying (fill) _________ in a form. - It’s no use (ask) _____ children (keep) ____ quiet. They can’t help (make) _________ noise BÀI 2 Rewrite the following sentences 13/Please don’t interrupt me all the time. -Would you mind_______________________________________________? 14/I would like you to help me to put the chairs away? - Do you mind_________________________________________________? 15/I’m quite happy to look after the baby for you. -I don’t mind __________________________________________________ 16/ “ I haven’t done anything wrong,” Tom said. -Tom denied __________________________________________________ 17/The driver of the car said it was true that he didn’t have a licence -The driver of the car admitted_____________________________________ 18/I remember someone telling me the news. -I remember being_______________________________________________ 19/Are you sure you paid those bills yesterday? -Do you remember ______________________________________________? 20/Don’t forget that you have to do this homework. -Please remember ______________________________________________ 21/She really didn’t want to upset him so she kept quiet. -She was anxious to avoid _________________________________________ 22/Don’t ask so many questions. -Please stop ____________________________________________________ 23/I think we’ve discussed phrasal verbs enough now. -Let’s stop______________________________________________________ 24/He hasn’t smoked for 3 years. - He stopped___________________________________________________ 25/They haven’t played chess for a long time. -They stopped ___________________________________________________

Cho 4 điểm A (0;-5) , B (1;-2) , C (2;1) , D (2,5;2,5) , trên x sao cho 3 điểm A (x;14) , B (-5;20) , C (7;-16) thẳng hàng