Viết cách xét 1 bpt Ví dụ: (m+1)x + 1 > 0 có nghiệm với mọi x ------------------------ vô nghiệm với mọi x (m + 1)(x + 1) > 0 có nghiệm với mọi x ----------------------------- vô nghiệm với mọi x

C.READING I. Read the text and choose the correct answer. If you enjoy cycling for pleasure, doing it in London can be a shock. There are not enough lanes especially for bikes, and making your way through the traffic can be very risky. But if you have great passion, cycling in London can be exciting, and it is an inexpensive way of keeping fit if you live there. Some cyclists don’t mind spending a lot of money on expensive bikes. However, if you just want a basic bike that is only for occasional use, there are many cheap choices. Several markets have cheap bikes on sale which may not be impressive to look at but should be satisfactory. You should buy a cycling helmet if you want to cycle in London. Wearing a cycling helmet is not compulsory in Britain, but it is a good idea to wear one for protection. 1. What is the main idea of the passage? A. Cycling helmets B. Cheap bicycles C. Bicycle markets D. Cycling in London 2. According to the passage, cycling in London is A. easy B. difficult C. tiring D. boring 3. The word “it” in line 3 refers to A. cycling B. passion C. excitement D. doing exercise 4. The difficulty of cycling in London is described in lines A. 2 B. 5 C. 5-6 D. 8-9 5. According to the passage, all the followings are true EXCEPT that A. It is compulsory to wear a helmet when cycling in Britain. B. Some bikes in London are cheap. C. There are not many lanes especially for bikes. D. Some cyclists don’t want to buy expensive bikes. II. Complete the text with the correct form of the verbs in the list. This is my favourite singer. He (1) a famous rock star. He (2) in America. He (3) all around the world and (4) in rock concerts. He (5) his songs and (6) his own video dips. In his free time, he (7) staying at home listening to his CDs. At weekends, he usually (8) to expensive restaurants with his friends. He also (9) a lot of books about strange things. I can’t wait to see him perform live. I (10) him so much. III. Choose the most suitable word for each space. What do you like doing best (1) your spare time? My cousin Paul likes going (2) in the country and (3) photos. Sometimes he (4) with his friends, and they (5) at the park or at the beach. They always (6) a good time. His brother Chris isn’t (7) on walking. He spends most of the (8) at home. 1. A. for B. when C. in D. at 2. A. for walks B. walks C. a walk D. to walk 3. A. making B. having C. taking D. doing 4. A. travels B. gets up C. sees D. goes out 5. A. enjoy B. have fun C. hobby D. go 6. A. have B. make C. do D. like 7. A. interested B. out C. decided D. keen 8. A. other B. time C. people D. money

Cho tam giác ABC cân tại A có đường cao AH và O là trung điểm của AH. Trên tia đối của tia OB lấy điểm D sao cho OD = OB a, Chứng minh tam giác OBH = tam giác ODA và AH vuông góc với AD b, Tia CO cắt đường thẳng AD tại E. Chứng minh A là trung điểm của đoạn thẳng DE. c, AC cắt BD tại I và gọi F là trung điểm của DC, Chứng minh 3 điểm E, I, F thẳng hàng d, AB cắt CE tại K. Chứng minh IK song song với ED

Tìm số nguyên x để biểu thức sau có giá trị nhỏ nhất: C=$\frac{-7}{(x+5)^{2}+1 }$

Cho ABC có diện tích bằng 160 cm. Trên cạnh AB lấy điểm M sao cho AM =2/3 x AB, trên cạnh AC lấy điểm N sao cho AN =3xNC. a) Tính diện tích tam giác ABN. b) Tính diện tích hình BMNC. MN help mình làm bài này!

Câu hỏi nối tiếp vs câu trc nhé mn Mong mn giúp mk

Từ tuy trống đánh lien thanh đến lo thấy nguy thay khúc đê này hỏng mất

vt cali chữ : yew cj sim nắm nuôn ❤ NL : fan cj sim lâu năm r

(3-2/3+4/3):(2 1/3-2,5) mũ 2 giup mik mik dang can gap ak

làm nhanh giúp mình với .Mình cần gấp