3. Một ca nô xuôi dòng sông 50km rồi ngược dòng sông ấy 32km thì hết 4h30'. Tính vận tốc của dòng nước, biết vận tốc riêng của ca nô là 18km'h.

Monica:”Peter often plays football” Monica told me (that)...

Cho tia Oy nằm giữa 2 tia Ox và Oz biết góc xOz =80 độ ,góc yOz=50 độ a, Tính số đo góc xOy b,Gọi Ot là tia đối của tia Oy,Tính số đo góc xOt

Giúp em với. Cần trước 22:30 ạ. Xong trong tối nay. Mong được sự giúp đỡ của chuyên gia và anh chị. Sơ Sài e k đánh giá nha Giúp bài 4 ạ.

43. What’s your daughter’s age, Mrs. Mai? How………………………………………………………………….? 44. Long is a bad swimmer. Long swims……………....................................……..................... 45. It takes me about two hours each day to do my homework. I spend …………………………………………… 46. He is a careful driver. He drivers ……………………………………… 47 . Long is a bad swimmer. Long swims ………………………………………………………. 2. My brother cycles slowly. My brother is ……………………………………………………….. 3. Mr. Cuong plays table tennis well. Mr. Cuong is ………………………………………………………. 4. Mrs. Chi is a quick typist. Mrs. Chi types ………………………………………………………………. 5. Thoa sings smoothly. Thoa is ………………………………………………………………………… 6. Miss Lan is a fast runner. Miss Lan runs …………………………………………………………………… 7. Mr . Hung is a safe driver. Mr. Hung drives …………………………………………………………….. 8. Minh’s sister dances marvelously. Minh’s sister is ……………………………………………………………….. 9. Mrs. Oanh cooks well. Mrs. Oanh is ………………………………………………………………….. 10. Khanh is a fluent English speaker. Khanh speaks ……………………………………………………………….. 11. Mr. Thanh couldn’t enjoy the meal because of the stomachache. The stomachache prevented ……………………………………………………. 12. What is your daughter’s age, Mrs. Mai? How ……………………………………………………………………..? 3. Lan didn’t go to school yesterday because of her sickness. Because Lan ……………………………………………………………….. 14. You shouldn’t eat too much meat. You’d ………………………………………………………………………. 15. How heavy is the chicken ? What …………………………………………………………………? 16.I get to work in half an hour. It takes ……………………………………………………………………… 17. Do you have a cheaper computer than this? Is this …………………………………………………………………..? 18. How much is this dictionary? How much ……………………………………………………………? 19. It isn’t important for you to finish the work today. You …………………………………………………………………………. 20. There are over eight hundred stamps in Tim’s collection. Tim’s collection …………………………………………………………….. 21.The black car is cheaper than the red car. The red car ………………………………………………………………… 22. There is a sink, a tub and a shower in the bathroom. The bathroom ……………………………………………………………… 23. No one in the group is taller than Trung. Trung is …………………………………………………………………… 24. Do you have a better refrigerator than this ? Is this ……………………………………………………………………….? 25. My house is the oldest house on the street. No house …………………………………………………………………………….

Bài 23: B=$\frac{5}{2.3}$+$\frac{5}{3.4}$+...+$\frac{5}{100.103}$ C=$\frac{1}{15}$+$\frac{1}{35}$+...+$\frac{1}{2499}$

18. I would like you to help me to put the chairs away. Do you mind……………........………………………? 19. The building has five floors. It’s……………………………………………………………….……………… 20. Nam likes staying at home than going to the zoo. Nam prefers……………………………………..……………….. 21. My sister speaks French fluently. My sister is……………………………………………………….. 22. We didn’t enjoy the trip because of the heavy rain. The heavy rain prevented……………………….……………….. 23. The ice is very thick. We can walk on it. The ice is thick………………………………………….…………………. 24. The black car is cheaper than the red car. The red car……………………………………………………………….. 25. My house is the oldest house on the street. No houses……………………………………………………………….. 26. These questions are quite difficult. I can’t do all of them. These questions are too…………………………………………………………………………. 27. I’m very sad that I wasn’t accepted in that group. I’m very sad not….………………………………………………..………… 28. Please don’t make any noise; I’m very tired. I’d rather……………………………………………. 29. Having a vacation abroad is very interesting. It’s……………………….…………………………. 30.How much does it cost to mail a letter to the USA? What is………………………………………………………….……..? 31. I get to work in half an hour. It takes………………………………………………………………. 32. Do you have a cheaper computer than this ? Is this…………………….…………………………..? 33. There are over eight hundred stamps in Tim’s collection. Tim’s collection…………………………………………………..……… 34. What is the price of this bag? How much…………………………….………………………….? 35. How heavy is your son ? What…………..…………………………….…………………..? 36.You shouldn’t eat too many candies. You’d…………..…………………..…………………. 37. My sister speaks French fluently. My sister is………………….………………………………….. 38. The movie is very interesting. What………………………………….………………………..! 39. Her son is ten years old. She has a……………………….............................................. 40. I like chocolate and she likes chocolate, too. I like chocolate and so………………………………………………….. 41. How tall is your sister? What……………………………..............................……? 42. How much is this dictionary? How much does………………………………………………………….?

Giải pt : x - 3 √(x+5) + 7 = 0

1. Cho HPT: $\left \{ {{x + my = m + 1} \atop {mx + y = 3m - 1}} \right.$ a) Giải HPT với m = 2. b) Trong trường hợp hệ có nghiệm duy nhất, tìm giá trị của m để tích xy nhỏ nhất. 2. a) Giải PT: 4$x^{2}$ - 12x - 7 = 0. b) Cho PT (m - 4)$x^{2}$ = 2mx + m - 2 (m là tham số). Tìm m để phương trình có hai nghiệm phân biệt.

Vai trò của lớp bò sát? Cho ví dụ? Rắn là loài động vật có lợi hay có hại? Tại sao Giúp mik