Cho ΔABC vuông tại A, AB = 5cm, góc ACB = 60 độ. a) Tính diện tích xung quanh và thể tích của hình nón tạo ra khi quay ΔABC quanh cạnh AB. b) Tính diện tích mặt cầu, thể tích hình cầu tạo ra khi quay nửa đường tròn ngoại tiếp ΔABC một vòng quanh cạnh BC. Mọi người giải giúp em. EM CẢM ƠN.

VIẾT MỘT ĐOẠN VĂN NGẮN TỪ 5 TỚI 7 CÂU CHỦ ĐỀ GIA ĐÌNH CÓ SỬ DỤNG PHÉP SO SÁNH , PHÉP NHÂN HÓA (CÓ MỞ ĐẦU, THÂN BÀI, KẾT LUẬN ) BẠN NÀO CHO MIK BÀI HAY LÀM CHÍNH XÁC NHƯ ĐỀ YÊU CÂU MIK CHO 5 SAO HAY NHẤT

Pollutions are harmful __________ human health. with at on to

Sắp xếp, ko thêm từ nha: 1. I/ to/ that/ friends/ volunteer/ helps/ make/ work/ new/ me/ believe/. (11 words) .......................................................................................................................................................

Choose the word to indicate the word OPPOSITE in meaning to the CAPITAL word: My hometown used to be a peaceful and QUIET city. A. crowded B. noisy C. polluted D. noisy Choose the best answer to complete the sentence: Tom: "Excuse me, which is the way to the post office?" Peter: "Sorry, I'm new here." Tom: "_________________________!" A. Bad luck B. Good luck C. That's true D. Thank you all the same Choose the best answer to complete the sentence: Public ____________ in my town is good and cheap. A. travel B. journey C. tour D. transport Choose the best answer to complete the sentence: A ___________ is a part of a road that only bicycles are allowed to use. A. cycle cross B. cycle lane C. cycle line D. cycle race Choose the best answer to complete the sentence: ___________ do you go to your home village every year? A. How B. How often C. How long D. How much Choose the best answer to complete the sentence: You must buy a ticket to ___________ . A. get on the bus B. turn on the bus C. turn up the bus D. go on the bus Choose the best answer to complete the sentence: He forgot to give a __________ before he turned left and got a ticket. A. hand B. signal C. sign D. light Choose the best answer to complete the sentence: If people ________ the rules, there are no more accidents. A. follow B. take care of C. like D. remember Các bạn làm nhanh nhất thì tự khắc sẽ đc hay nhất, nếu chậm trễ thì dù đẹp mình sẽ ko thể cho đc nhé! Cảm ơn các bạn nhiều <3

Cho `a,b,c>0` tm `a+b+c=3`. CMR: `a/(b+c^2)+b/(c+a^2)+c/(a+b^2)\ge 3/2`

Viết thành câu bị động 1. They have used this car for many years. -> This car 2. She hasn't used this bicycle for a long time -> This bicycle 3. People have used the Internet all over the world -> The Internet

M(-2; 3), vecto n = (5;-1) Mg giải giúp em với TÌM PTTQ, PTCT, PTTS

Choose the word or phrase that best completes the following sentence: If you_____________noise pollution for a long time, you can have headaches and hearing loss. (5 Points) experience experienced will experience can experience 2.Choose the word or phrase that best completes the following sentence: ___________there was a lot of acid rain, many bonatical species died last year. (5 Points) Since Cause Although So 3.Choose the word or phrase that best completes the following sentence: Pollutions are harmful __________ human health. (5 Points) with at on to 4.Choose the word or phrase that best completes the following sentence: Scientists has just __________ a solution to hearing loss (5 Points) show to come up with go down go on 5.Choose the word or phrase that best completes the following sentence: Many animals and plants die___________the polluted water. (5 Points) because due to because of Both B & C 6.Choose the word or phrase that best completes the following sentence: If there____________fewer cars on the road, there would be less noise pollution. (5 Points) is are were was 7.Choose the word whose CAPITAL part is pronounced differently from the other three: (5 Points) kicK Knight picK Kind 8.Choose the word that has different stress pattern: (5 Points) medical hospital politic electric 9.Choose the word or phrase that best completes the following sentence: If we dump a plastic into the ground, it __________ a long time to disappear. (5 Points) takes will take take took 10.LỚP: 8C3 8C5 11.Choose the word or phrase that best completes the following sentence: " I think we should protect the environment by using recycled bottles." "_______________." (5 Points) Congratulations! That's a good idea! Well done! The same to you! 12.Choose the word or phrase that best completes the following sentence: If the factory continues dumping poisons into the lake, all the fish and other___________animals will die. (5 Points) aquatics aquatic aquatical aquatically 13.Choose the word or phrase that best completes the following sentence: Many people_____________litter on the streets. (5 Points) pay give throw catch 15.Choose the word or phrase that best completes the following sentence: What would you do if a factory in your neighborhood __________ untreated water ____________ the river? (5 Points) dump______to dumped________to dump_______into dumped_______into 16.Choose the word or phrase that is CLOSEST in meaning to the CAPITAL part in the following sentence: The water supply is being tested for CONTAMINATION. (5 Points) POPULATION POLLUTION COMBINING CONTAINING 17.Choose the word that has different stress pattern: (5 Points) scientific dramatic domestic athletic 18.Choose the word or phrase that best completes the following sentence: If Hoa___________ill, she would join our activity to protect the local environment. (5 Points) wasn't weren't isn't Both A & B 19.Choose the word or phrase that best completes the following sentence: Do you know what is the cause __________ pollution? (5 Points) in of on for 20.Choose the word or phrase that best completes the following sentence: When___________ pollution happens, the water temperature in streams, rivers and lakes, or oceans changes. (5 Points) water temperature thermal heat 21.Choose the word whose CAPITAL part is pronounced differently from the other three: (5 Points) pollutED playED earnED diED 22.Choose the word or phrase that best completes the following sentence: Many chidren around the world are suffering from birth defects because their parents are_________ to radiaton. (5 Points) worked expressed supposed exposed giúp e nhanh vs ạ

Một lớp học hình hộp chữ Nhật có chiều dài 8m rộng 6m và cao 3,6m . Đồ đạc chiếm 4m2 không khí mỗi người cần 5m khối không khí để thở . Tính số học sinh có thể nhiều nhất nếu thường xuyên có 1 giáo viên và học sinh trong lớp học đó