Chuyên gia các bn prororo giúp mk với Cho a,b,c là các số nguyên thõa mãn `a^2/(a^2 + b^2) + c^2/(a^2 + c^2) = (2c)/(b+c)`. Cm `bc` là số chính phương

hãy chỉ ra các bptt xuất hiện trong bài thơ bếp lửa

$\frac{2+x}{2-x}$ : $\frac{4x^2}{4-4x+x^2}$ . ( $\frac{2}{2-x}$ - $\frac{4}{8+x^3}$ . $\frac{4-2x+x^2}{2-x}$)

Viết đoạn văn ngắn biểu cảm về học tập và tấm gương đạo đức.

Cho tam giác ABC cân ở A,phân giác góc B và C cắt AC và AB ở D và E a,DE//BC b,Biết DE=10cm,BC=16cm,AE=5cm.Tính độ dài AB

Each sentence has a mistake find and correct it. 1. We arrived at London at 3 o'clock in the morning. 2. My home village is on the West of the city. 3. She wanted to know how long did it take to get to Ha Noi by plane. 4. She told me to shut the door but don't lock it. 5. Nam asked Mai what can he do to help her. 6. Your friends went to your native village last weekend, weren't they? 7. I'd like to go out for dinner, but I don't feel like to eat out tonight. 8. Summer in England is the better season of all. 9. If we would have a large garden, we would plant a lot of flowers in it. 10. I have so much money that I don't know What do with it. 11. Although my next door neighbor is not very cleverly, he is hard- working. 12. In spite the danger, they managed to cross the river during the night. III. Each sentence has a mistake identify and correct it. 1. Lynn wishes she had a bigger apartment and can buy a car. 2. When I was young, I often go fishing and played blindman's buff. 3. What do you use to do when you stayed at home alone? 4. We've corresponded with each other for years but I've never meet him. 5. It's very crowded here and I wish there aren't so many people. 6. This is the first time she forgot to give me a message at night. 7. This type of clothes is going to be introduce to Europe by Chinese. 8. My father worked for the company for nearly thirty years. 9. Vietnamese women today prefer modern clothes than Ao Dai. 10. This work have to be completed by the students before the break.

cho hệ pt : mx-y=1 x+my = 2 Tìm m để hệ phương trình có nghiệm x;y thỏa mãn x+y=1

Câu1:Chỉ ra NT của câu: Ở trên đời này,con ít khi thành công lắm,nhưng khi con mệt mỏi,con thất bại,con sắp gục ngã,con đã biết di tìm mẹ. Câu2:Nêu tác dụng của NT tìm được ở câu 5. Câu3:Em hiểu như thế nào về câu: "Và điều cuối cùng con muốn nói với mẹ rằng:con nhớ mẹ quá nhiều,nợ mẹ quá nhiều".

Each sentence has a mistake find and correct it 1. How about having dinner and then go to the theater? 2. It's possible store solar energy for a number of days. 3. Our environment has become worse but there are many factors causing from men. 4. My recent electricity is enormous so I'm worried in it. 5. She turned on her radio at the lowest in order not to disturb the others at night. 6. The path was made by walkers where crossed the mountains some years ago. 7. Tan and his lovely cat which the police are finding disappeared last week. 8. Let me congratulate you on pass your exam to university. 9. The woman who son is excellent in math lives next door to us. 10. Lynne, who is a friend of mine, has a great sense of humorous. 11. Do you find Jack, that is a new student, intelligent? 12. Relations between the 2 countries have been badly damage by this incident. 13. According to the weather forecast, it will be sun tomorrow. 14. In Asia, a tropical storm is called "typhoon" where is coming from Chinese language. 15. He has just come back to the village when he was born. 16. I have been in England during the spring of 1989. 17. The bus was crowded with passengers. So, he had to stand all the way. 18. The car stopped for the children whom were waiting to cross the road. 19. Let's have a picnic on the beach, shan't we? 20. The reason which I haven't to Hawaii is that I can't afford it.

nhập vào 1 số n sau đó đếm xem n có bao nhiêu chữ số