Giải các phương trình sau: ( Giúp mình với cảm ơn ạ.)

Một đầu tàu hoả A kéo các toa xe chuyển động đều với lực có độ lớn là 5000 N, làm các toa xe đi dc quảng dg dài 3000m.Tính công lực kéo của đầu tàu hoả A

phân tích thành nhân tử giúp em với ạ a)X2 +5x+5y+2xy+y2 b) x2 – 16-2xy +y2

EXERCISE 4. WH - QUESTIONS. 37. Why didn't they help him? .................................................................................................................. 38. How many games has the team played? .................................................................................................................. 39. Where do people speak English? .................................................................................................................. 40. Who are they keeping in the kitchen? .................................................................................................................. 41. How can they open this safe? .................................................................................................................. 42. What books are people reading this year? .................................................................................................................. 43. How did the police find the lost man? .................................................................................................................. 44. Who look after the children for you? .................................................................................................................. 45. How long have they waited for the doctor? .................................................................................................................. 46. What time can the boys hand in their papers? .................................................................................................................. 47. Who lend you this book? .................................................................................................................. 48. How many marks does the teacher give you? ..................................................................................................................

Nhờ mn giúp, mk cần gấp (sẽ đánh giá 5* và cảm ơn cho mọi câu trả lời)

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Giải phương trình $cos^{3}x+$ $cos^{2}x-$ $4cos^{2}\frac{x}{2}=0$ giúp mình với

câu tường thuật 1. “Is a return ticket cheap tonight?” my uncle said. 2. “Do these puppies travel free?” a dog owner asked. 3. “Can I bring my dog into the plane with me?” she asked him. 4. “Does this train stop at York?” Bill told me. 5. “Can you telephone from inter – city trains?” businessman said. 6. “Does the 2.40 train have a business room?” he said. 7. “Can you get coffee on the train?” my aunt asked.

Tìm 5 phân số mà giá trị của mỗi phân số đó lớn hơn -1/3 và nhỏ hơn -1/4.

A/ and I went with three friends B/ but I got up early and went to C/ but we didn’t mind D/ because I couldn’t find it when I got on the coach E/ because for four of us it was our first time away from home F/ so we decided to travel by coach G/ so we went to Hyde Park for a game of football The first time I went abroad was when I went to London. It was in the summer holidays about five or six years ago (0) A . The plane and train were quite expensive, (1)_______. We left at five o’clock in the morning and the journey to London took about sixteen hours, (2)_______: we were all very excited (3)_______. We stayed in London for three days, in a youth hostel not far from the center. While we were there, we walked a lot. We went to see all the famous sites – Big Ben, Piccadilly Circus, Buckingham Palace and so on. On the last morning, my friends stayed in bed late, (4)_______ Camden Market. You can buy all things of jewelry and clothes there. It was really hot and sunny in the afternoon, (5)_______. I’ve been back to London several times since then, but I don’t think I’ll ever feel as excited as I did that first time.