Mn giúp mình với nhé. C.ơn!!!!!!!

Giúp mình mấy câu lý thuyết này với. Thanks <3

cho các số dương x,y thỏa mãn 7x^2 -13xy -2y^2=0 Tính giá trị biểu thức A= $\frac{2x-6y}{7x+4y}$ giúp mình nha mình cần để nộp gấp cảm ơn các bạn nhìu

Ở đầu đường dây tải điện có đặt máy tăng thế có số vòng ở cuộn sơ cấp là 500 vòng, cuộn thứ cấp là 11000 vòng. Hiệu điện thế đặt vào cuộn sơ cấp là 1000V. a) Tìm hiệu điện thế ở cuộn thứ cấp? b) Tìm công suất hao phí trên đường dây tải điện, biết điện trở tổng cộng trên đường dây là 100, công suất truyền tải đi là 110000W.

giúp me b6 này đi plsssssssssssssssss

tìm các từ ngữ miêu tả: Tả chiều rộng:

21. A. hill B. ship C. kite D. chip 22. A. cheap B. great C. peace D. meal 23. A. evening B. extreme C. scene D. excite 24. A. garage B. village C. message D. shortage 25. A. field B. movie C. quiet D. piece III – Read the passage and choose the correct answers (1pt) If you are the type of person who loves to meet many different people from different cultures and social status, then the city life is better for you. The city is where people from all background and status come to work and live because everything is so centralized in the city. The city’s population is also more concentrated, so you also have a higher chance of meeting people. In the country, the distabce between oother people is harder, so it is less convenient to meet other people. Hence, if you want a busy social life, the city is better. If you have a asthma or you are really sensitive to pollution, then the country lifestyle is the best for you. In the country, there is much less pollution because there is less cars, traffic and industrial plants in the country. There are also more trees, rivers and other natural scenery. If you want your kids to run around in open and safe environments, then the country is also much better. 31. You should live in the city if _____________________________. A. You have asthma B. you have problems with breathing diseases C. you want to meet people from social status D. you want your children to run around in open environments. 32. The country life is better for you if ___________________________. A. you love to meet people from different cultures B. you want a busy social life C. you would like to work for international company D. you are really sensitive to the pollution 33. There is much less pollution in the country than in the city because _______________. A. everything is so centralized in the city B. there are not as many cars in the country as in the city. C. the distance between other people is harder. D. there are much more trees in the city. 34. The word “plants” in the passage means __________________. 4 A. factories B. trees C. buildings D. restaurants 35. Which of the following statements is NOT true? A. The pollution in the city is concentrated. B. You have higher opportunities of meeting people in the city. C. There is more traffic in the country than in the city. D. The environment in the country is safer than in the city.

Xác định chiều của cảm ứng từ, giải thích chi tiết giúp mình nha. Cảm ơn rất nhiều :)

Cho a2*(b+c)=b2* ( c+ a )=2013 .Tính c2* (a+b)

Viết đoạn văn diễn dịch khoảng 10 câu với chủ đề sau: " Không nên vứt rác bừa bãi "