Đáp án:
Giải thích các bước giải:
`a) 2x + 6 = 5`
`<=> 2x = 5 - 6`
`<=> 2x = -1`
`<=> x = (-1) : 2`
`<=> x = (-1)/2`
Vậy `S = (-1)/2`
`b) 2x^2 + 4 = 12`
`<=> 2x^2 = 12 - 4`
`<=> 2x^2 = 8`
`<=> x^2 = 8 : 2`
`<=> x^2 = 4`
`<=> x^2 = (+-2)^2`
`<=> x = +-2`
Vậy `S = {2; -2}`
Giúp mình nha, ai nhanh cho trlhn
1. The man for (A) who the police (B) are looking (C) robbed (D) the bank last week. 2. Today, (A) the number of people (B) whom moved into this city (C) is almost double (D) that of twenty years ago. 3. They work (A) with (B) a person (C) his name (D) is John. 4. (A) The man (B) whom you (C) are looking for (D) living in this neighborhood. 5. (A) His father warned (B) him not (C) repeating (D) that mistake again. 6. My mother (A) will fly to Ha Noi, (B) that is (C) the capital city (D) of Vietnam. 7. She (A) is (B) the most beautiful girl (C) whose I have (D) ever met. 8. Every student (A) who (B) majors in English (C) are ready to participate (D) in this contest. 9. (A) The policeman must try (B) to catch those people (C) whom drive (D) dangerously. 10. The person (A) about who (B) I told you yesterday (C) is coming here (D) tomorrow. 11. (A) Mother's Day is (B) the day when children show (C) their love to their mother (D) one. 12. (A) Do you know (B) the reason (C) when we should learn (D) English? 13. (A) That is the (B) woman who (C) she told me (D) the news 14. It is (A) complicated (B) because pollution (C) is caused by things (D) when benefit people. 15. (A) New Year Day is the day (B) where my family members (C) gather and enjoy it (D) together. sửa lỗi sai luôn ạ
Thầy/cô hãy liệt kê một số từ ngữ thể hiện mức độ yêu cầu cần đạt trong xác định mục tiêu chủ đề/bài học? moodun 3 thcs môn địa lí
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1. She is talking about the author________book is one of the best-sellers this year. A. which B. whose C. that D. who 2. He bought all the books__________are needed for the next exam. A. that B. what C. those D. who 3. The children,__________parents are famous teachers, are taught well. A. that B. whom C. whose D. their 4. Do you know the boy________we met at the party last week? A. which B. whose C. who D. whom 5. The exercises which we are doing________very easy. A. is B. has been C. are D. was 6. The man_______next to me kept talking during the film, _______really annoyed me. A. having sat / that B. sitting / which C. to sit / what D. sitting / who 7. Was Neil Armstrong the first person________foot on the moon? A. set B. setting C. to set D. who was set 8. This is the village in________my family and I have lived for over 20 years. A. which B. that C. whom D. where 9. My mother,________everyone admires, is a famous teacher. A. where B. whom C. which D. whose 10. The old building__________is in front of my house fell down. A. of which B. which C. whose D. whom 11. We need a teacher__________native language is English. A. who B. whose C. whom D. that 12. I bought a T- shirt________is very nice. A. who B. whose C. whom D. that l3. The woman,________was sitting in the meeting hall, didn't seem friendly to us at all. A. who B. whom C. where D. when 14. The man with__________I have been working is very friendly. A. who B. that C which D. whom 15. We'll come in May__________the schools are on holiday. A. that B. where C. which D. when
Vẽ hoa ( hoa j cũng được ) :> cái gọi là yêu đơn phương ,cảm giác mang lại cho ta là gì ?
Giải bài toán sau bằng hệ phương trình: Biết rằng nước biển chứa 5 % muối (theo khối lượng). Hỏi phải thêm vào 40 kg nước biển bao nhiêu ki-lô-gam nước tinh khiết để được một loại nước có chứa 4 % muối?
Three great campsites to try this summer Sandy Bay This campsite is on an excellent beach, and has its own surfing school with special prices for campers. You can also learn to windsurf and sail there. The sea is safe for swimming, so it’s a great place for families. The large swimming pool is great in summer, and has a wide area of grass around it. Its small supermarket has long opening hours. It doesn’t matter what size tent you bring, as the campsite is large and you won’t be too near your neighbours! High Wood There are lots of activities you can do at High Wood campsite, from fishing to cycling, and they’ll lend you any of the equipment you need. It’s not as large as some campsites, but it’s clean and modern. It has a fantastic pool with a roof window which can open and close. There’s also a special area where you can watch films or dance under the stars to local bands. For food shopping, try the shop in the nearby village. Black Lake The wonderful thing about Black Lake campsite is waking up in the morning and seeing the beautiful mountains all around you. You don’t have to bring your own tent – there are some already there you can pay to use. There’s lots to do – you can swim in the lake or walk in the forest. And don’t forget to bring your mountain bike with you! If you want to cook for yourself, the shop in the next village has a good variety of food.
Câu 4. (3 điểm) Cho đường tròn (O, R) và điểm 4 cổ định ngoài đường tròn. Qua A kẻ hai tiếp tuyến AM, AN tới đường tròn (M.N là tiếp điểm). Một đường thẳng d đi qua A cắt đường tròn (O, R) tại B.C (AB < AC). Gọi I là trung điểm của BC. 1) Chứng minh năm điểm A,M,N,O.I thuộc đường tròn. 2) Chứng minh: AM^2 = AB.AC. 3) Đường thẳng qua B, song song với AM cắt MN tại E. Chứng minh rằng: IE//IMC. giúp mình cả bài hình nhé
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