tìm sô nguyên tố p sao cho p+14 và p+28 là sôs nguyên tố

giải phương trìnhhhhhhhhhhhhhhhhhhhhhhh

Giúp mình với mình cần gấp lắm ạ !!!!!!!!!!!

Bài 4: Cho đường tròn , đường thẳng d không đi qua O và cắt đường tròn tại hai điểm phân biệt A và B. Từ một điểm C trên d (C nằm ngoài đường tròn ) kẻ hai tiếp tuyến CM, CN với đường tròn (M, N là các tiếp điểm). Gọi H là trung điểm của AB, đường thẳng OH cắt tia CN tại K. a)Chứng minh: 4 điểm C, O, H, N cùng nằm trên một đường tròn. b)Chứng minh: KN . KC = KH . KO. c)Một đường thẳng đi qua O và song song với MN cắt các tia CM, CN lần lượt tại E, F. Xác định vị trí của điểm C trên d sao cho tam giác CEF có diện tích nhỏ nhất. mong mn help mình

cho biểu thức A= căn x+3/căn x-2 và B= 1/ căn x-2 + 1/căn x+2 - x/4-x a, cho x=16. tính A b, rút gọn B c, tìm x để B(căn x-2) + 2căn x = x -căn 7(x-2) +7

1. If I ...... you, I .... volunteer to clean the beach. A. am/will B. was/ will C. am/would D. were/would 2. If our school .... the tree planting project, I .... join in. A. organises/will B. organises/ would C. organised/ would D. organised/will 3. Without water, there .... no lives on the earth so we have to reduce water pollution. A. was B. were C. will be D. would be 4. A: ............. B: That's the reason why I usually have headaches. A. This song sounds great. B. The river is seriously contamianated. C. Our city has too much noise pollution. D. You ate too much raw meet tonight. 5. A: ............. B: Let's clean it up. A. The rooom is so dirty. B. Air pollution does harm to our health. C. Farmers use too much pesticide that badly affetcs soil and small animals. D. What do you think about water pollution in our neighbourhood? 6. The polluted water results .... the death of several creatures A. in B. on C. of D. for 7. The reduction in air pollution was ...... last year. A. drama B. dramatic C. dramatise D. dramatically 8. In many poor nations, there are frequent outbreaks of cholera and other diseases because people there ........ untreated water. A. drink B. to drink C. drinking D. drank 9. .......water is one of the factors that have driven many species to the verge of extinction A. Contaminating B. Contaminated C. Contaminant D. Contamination 10. Too much carbon dioxide in the atmosphere causes global ....... A.warm B. warming C. warmly D. warmth 11. Environmental pollution has ........ to lots of health problems. A. caused B. led C. made D. resulted 12. _____ industrial waste, many fish cannot survive. A. Because B. Since C. As D. Because of 13. Choose the word which has a different stress pattern from the others. A. medical B. hospital C. politic D. eletric 14. Choose the word which has a different stress pattern from the others. A. physical B. horrific C. beautiful D. different 15. The sight of too many advertising billboards, overhead poles and shop signs causes __________ pollution A. air B. light C. visual D. noise 16. When thermal pollution happens, the water temperature in streams, rivers, lakes and oceans __________. A. changes B. keeps C. remains D. stays 17. Choose the word which has a different stress pattern from the others. A. national B. chemical C. medical D. informal 18. Oil spills from cargos and ships have _____ many animals and plants die. A. made B. resulted C. caused D. led 19. If we ........... glass, we ......... air pollution by 20 percent. A. recycle/reduce B. recycled/ reduced C. recycle/ will reduce D. recycled/ would reduce Read the passage and decide whether the following statements are True or False? Air pollution is a serious problem in many cities. Motor vehicles, factories and other sources create so much air pollution that it may hang in the air like dirty fog. Air pollution threatens the health of the people who live in cities. City wastes cause water pollution when they are poured into the water-ways. These wastes kill fish and make some areas unfit for swimming. In addition, many large cities have difficulties in disposing of their garbage. The amount of garbage grows each year, but places to put it are quickly filling up. Citizens, governments, industries, scientists, and business people must work together in different ways to gradually reduce pollution. For example, most cities have introduced recycling programmes. Tùy chọn 1 1. Motor vehicles and factories are among some sources of air pollution. True False 2. Air pollution doesn’t endanger people’s health in some cities. True False 3. Air pollution is the only problem of the environment mentioned in this passage True False 4. Garbage disposal is a problem in many large cities. True False 5. Everyone must cooperate to reduce pollution. True False 6. We can reduce pollution by recycling programmes only. True False các bn làm chính xác giúp mik nha đây là bài kiểm tra của mik đấy các pro giúp mik nha chính xác đấy

Nêu điểm khác biệt về thành phần và phương thức diệt trừ sâu hại giữa chết phẩm Bt và NPV?

Làm giúp em bài 3 ạ cảm ơn anh chị nhìu

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Viết lại câu sử dụng Unless 1. Because of the heavy rain, we came to the class late. 2. She felt so tired and she couldn't go to the cinema with us. 3. I lost the way to come back the hotel because I hadn't got the map of this city. 4. My father went to work yesterday so he didn't know what happened to me. 5. The teacher's question was so difficult that I couldn't answer. 6. He missed the first bus because he didn't start earlier. 7. She failed the final exam because she din't learn hard. 8. Because you don't stop immediately, I call your father. 9. I couldn't phone Alice because I didn't know her telephone number. 10. I don't know your decision so I can't tell them. 12. The weather is so hot that we can't go out. 13. She came late and she couldn't meet him. 14. He had a flu because he went out in the rain last night. 15. Smoking makes him so weak. 16. I didn't watch TV last night because I was busy. 17. Stop talking or you won't finish work on time. Mong mọi người giúp em với ạ. Chỉ chấp nhận cách sử dụng unless thôi nhé.