Giải giúp mình ạ, hình như là cho cos a bằng cos b á. Thanks

em hãy nêu tiêu chuẩn chuồng nuôi hợp vệ sinh ? khi xây dựng chuồng nuôi nên theo hướng nào ? giúp tớ nha

Mọi người cho e hỏi câu này với ạ

cali : Học Sinh Giỏi Huyện NL : Yeah!toi lên học sinh giỏi huyện r!

Nhanh len nhe 20 diem do Ko can viet giay cx dc a

Mọi người cho e hỏi câu này với ạ

16 Mark the letter A, B, C or D on your answer sheet to indicate the word(s) CLOSEST in meaning to the underlined word(s) to each of the following questions. Question 15: It’s too dangerous to climb up the mountain. A. normal B. unusual C. brave D. risky 17 Circle the letter A, B, C, or D to indicate the sentence that is closest in meaning to the given one. Question 23. The strong winds last night scattered debris across the seaside. A. Debris has been scattered across the seaside by the strong winds last night. B. Debris is scattered across the seaside by the strong winds last night. C. Debris was scattered across the seaside. D. Debris was scattered across the seaside by the strong winds last night. 18 Choose the underlined part A, B, C or D that needs correcting. Picture 15 A. A B. B C. C D. D 19 Choose the word whose underlined part is pronounced differently from the others. A. disaster B. grandma C. damage D. natural 20 Choose the best answer A, B, C or D to complete the sentence. Question 9: A heavy storm swept through the village and many people ______. A. kill B. killed C. are killed D. were killed 21 Choose the word whose stressed pattern is pronounced differently from the others. A. bury B. erupt C. provide D. collapse 22 Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions. Saving the Environment: One Home at a Time Pollution can be seen not only throughout the world, but also in our own homes. It comes from household chemicals, the amount of water people use and the waste people produce and throw away. What can be done to stop this pollution? Surprisingly, a person can help save the environment by doing simple things. First, we need to recycle, which allows products to be used over and over again. Recycling can also reduce the number of trees cut down to produce paper products. It takes very little effort. It is not hard to place plastic and glass bottles, aluminum cans and paper in a bin. Anyone can do it. Second, we need to watch the amount of water used at home. It can be conserved by taking short showers instead of baths, repairing leaky faucets, using the dishwasher or washing machine only when fully loaded, or simply turning the faucet off while brushing your teeth. Third, we need to reduce waste. We need to recycle whenever possible, but should also try to use this waste effectively. For example, grass clippings and food scraps can be made into compost for plants. The average person produces 4.3 pounds of waste every day, but we can reduce that amount by recycling and reusing. If we do our part in our own homes, we can help keep the planet from becoming more polluted. Question 20. Recycling helps to reduce waste because_______ A. plants need to develop B. waste can be recycled and reused C. a person can do it in his home D. an average man produces compost for plants 23 Circle the letter A, B, C, or D to indicate the sentence that is closest in meaning to the given one. Question 24. In 2004, a tsunami suddenly destroyed a part of Indonesia. A. A part of Indonesia was suddenly destroyed by a tsunami in 2004. B. A part of tsunami suddenly destroyed Indonesia in 2004. C. A part of Indonesia is suddenly destroyed Indonesia in 2004. D. Indonesia suddenly destroyed a tsunami in 2004 24 Choose the best answer A, B, C or D to complete the sentence. Question 12: I warned him _____too close to the fire. A. didn’t go B. not to go C. not go D. no going 25 Mark the letter A, B, C, or D on your answer sheet to indicate the word(s) OPPOSITE in meaning to the underlined word(s) in each of the following questions. Question 16: The villagers have been taken to a safe place where temporary accommodation will be provided for them. A. permanent B. mutable C. passing D. transitory

Hòa tan hoàn toàn 1 lượng bột Fe vừa đủ 50ml HCl chx biết nồng độ phản ứng kết thúc được 5,6 l khí H( đktc) A. Viết PTTH B. Tính m Fe đã phản ứng C tính Cm HCl đã dùng D. Tính nồng độ mol / l của các chất sau phản ứng

6 Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions. Saving the Environment: One Home at a Time Pollution can be seen not only throughout the world, but also in our own homes. It comes from household chemicals, the amount of water people use and the waste people produce and throw away. What can be done to stop this pollution? Surprisingly, a person can help save the environment by doing simple things. First, we need to recycle, which allows products to be used over and over again. Recycling can also reduce the number of trees cut down to produce paper products. It takes very little effort. It is not hard to place plastic and glass bottles, aluminum cans and paper in a bin. Anyone can do it. Second, we need to watch the amount of water used at home. It can be conserved by taking short showers instead of baths, repairing leaky faucets, using the dishwasher or washing machine only when fully loaded, or simply turning the faucet off while brushing your teeth. Third, we need to reduce waste. We need to recycle whenever possible, but should also try to use this waste effectively. For example, grass clippings and food scraps can be made into compost for plants. The average person produces 4.3 pounds of waste every day, but we can reduce that amount by recycling and reusing. If we do our part in our own homes, we can help keep the planet from becoming more polluted. Question 17. Pollution is caused from the following sources except A. wastes B. water in rivers C. house chemicals D. water from households 7 Circle the letter A, B, C, or D to indicate the sentence that is closest in meaning to the given one. Question 22. He did his homework, and then he watched TV. A. Before he had done his homework, he watched TV. B. By the time he did his homework, he had watched TV. C. Before he did his homework, and then he watched TV. D. After he had done his homework, he watched TV. 8 Mark the letter A, B, C or D on your answer sheet to indicate the most suitable response to complete each of the following exchanges. Question 14. “No one was killed in the forest fire two days ago.” “____________” A. That’s shocking! B. How terrible! C. That’s a relief. D. Oh dear. 9 Choose the word whose stressed pattern is pronounced differently from the others. A. technology B. astrology C. apology D. sociology 10 Mark the letter A, B, C or D on your answer sheet to indicate the most suitable response to complete each of the following exchanges. Question 13. Hoa: “Thank you for your help, Lan.” Lan: “____________” A. Forget it. B. Don’t say my name. C. No problem. D. It’s my pleasure.

Giải thích nữa nha ::: Câu 11. [VD] Cho hai đa thức 𝐻(𝑥)=𝑥3−4𝑥2−11 và 𝐺(𝑥)=3𝑥3+𝑥2+2. Đa thức 𝑃(𝑥) thoả mãn 𝑃(𝑥)+𝐻(𝑥)=𝐺(𝑥) bằng: A. 2𝑥3+5𝑥2+13 B. −2𝑥3−5𝑥2−13 C. −5𝑥2+13 D. 2𝑥3+13 Câu 12. [VD] Cho hai đa thức 𝑀(𝑥)=3𝑥3−7𝑥2+𝑥−5 và 𝑁(𝑥)=−3𝑥3−3𝑥+1. Biết đa thức 𝑃(𝑥)=𝑀(𝑥)+𝑁(𝑥), bậc của đa thức 𝑃(𝑥) bằng: A. 2 B. 3 C. 1 D. 6 Câu 13. [TH] Cho 𝑎 là nghiệm của đa thức 𝐻(𝑥)=4𝑥−9. Khi đó, 2𝑎 có giá trị bằng: A. 92 B. 89 C. 4 D. −92 Câu 14. [TH] Cho đa thức 𝐹(𝑥)=𝑥4−3𝑥−10. Trong các giá trị dưới đây, giá trị là nghiệm của đa thức 𝐹(𝑥) là: A. 𝑥=2 B. 𝑥=−2 C. 𝑥=5 D. 𝑥=−1 Câu 15. [VD] Số nghiệm của đa thức 𝐻(𝑥)=𝑥3−7𝑥 là: A. 3 B. 2 C. 1 D. 0 Câu 16. [VD] Đa thức 𝐾(𝑥)=𝑥2−𝑎𝑥−3 có một nghiệm 𝑥=1. Khi đó, giá trị của 𝑎 bằng: A. −2 B. 2 C. 4 D. −4