Baøi 2. Tìm các giá trị của m, a và b để các cặp phương trình sau đây tương đương: a. mx^2 – (m + 1)x + 1 = 0 và (x – 1)(2x – 1) = 0 b. (x – 3)(ax + 2) = 0 và (2x + b)(x + 1) = 0

Tìm số tự nhiên x biết : 100 x ; 75 x và 3 < x < 60 100 x và 240 x và x lớn nhất

- Xác định sự phân bố dân cư khác nhau ở phía tây và phía đông kinh tuyến 1000, sự di dân từ vùng phía Nam hồ Lớn và vùng Đông Bắc ven Đại Tây Dương xuống phía Nam và Duyên hải Thái Bình Dương?

Câu 1: một bóng đèn có hiệu điện thế định mức là 220V. Để đèn hoạt động bình thường, phải đặt vào 2 đầu bóng đèn một hiệu điện thế là: A. 220V B. 110V C. 200V D. 300V Câu 2: nếu ta chạm vào dây dẫn có dòng điện ( dây dẫn trần) dòng điện sẽ truyền qua cơ thể gây co giật, thậm chí là chết người là do A. tác dụng nhiệt của dòng điện B. tác dụng hóa học của dòng điện C. tác dụng từ D. tác dụng sinh lý Câu 3: trong vật nào dưới đây không có các electron tự do A.một đoạn dây nhôm B. một đoạn dây đồng C. một đoạn dây nhựa D. một đoạn dây thép

Giúp mk B4 với ạ . Mk sẽ vote 5* và cảm ơn

The young today are facing a world (23) _____which communication and information revolution has led (24) _____changes in all subjects. New demands are often placed on the schools in addition to the existing ones, to be (25) ____with current knowledge and modern methods of acquiring new knowledge. The most modem concept that has appeared in the schools of the U.S. is flipped classrooms, (26) ____ students watch teachers’ lectures at home and do what is called homework in class. Teachers record lessons which students watch on their smart phones, home laptops or at lunch breaks in the school libraries. In class, they do projects, exercises or lab work in small groups while the teachers are just the (27) ____ . In no time will this be trend in most of the Vietnamese schools too. 23 A:in B:on C:x D:at 24 A:about B:with C:to D:for 25 A:taught B:given C:equipped D:learned 26 A:on which B:somewhere C:where D:in what 27 A:applicant B.providers C:developers D:facilitators

vẽ hình cau :Cho tam giác ABC. Trên tia đối của tia AB lấy điểm D sao cho AD = 2AB. Trên tia đối của tia AC lấy điểm E sao cho AE = 2AC. Chứng minh rằng a). ADEABC b). Tìm tỉ số đồng dạng. chi can ve hnh thôi

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits blank (17). Tet is a national and (17)______ festival in Vietnam. It is an occasion for every Vietnamese to be reunited to think (18)______ their past activities and hope for good luck in the year to come. Before Tet, all houses are white washed and (19)______ with yellow apricot flowers and colourful lanterns. Everybody is looking forward to a more favorable life. On the New Year’s Eve, children are smartly dressed. They are hoping to (20) ______ money put in small red envelopes as they are wishing longevity to their grandparents and parents. Wrong doings (21) ______ be absolutely avoided on these days. A: modern B: traditional C: summer D: music 7 Choose the best sentence which has a similar meaning to the given one. Question 23. Unless you go to Hue festival, you won’t know why we like the oriental night show. A: If you don’t go to Hue festival, you will know why we like the oriental night show. B: If you go to Hue festival, you will know why we like the oriental night show. C: If you know why we like the oriental night show, you don’t go to Hue festival. D: If you come to Hue festival, you won’t know why we like the oriental night show. 8 Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits blank (21). Tet is a national and (17)______ festival in Vietnam. It is an occasion for every Vietnamese to be reunited to think (18)______ their past activities and hope for good luck in the year to come. Before Tet, all houses are white washed and (19)______ with yellow apricot flowers and colourful lanterns. Everybody is looking forward to a more favorable life. On the New Year’s Eve, children are smartly dressed. They are hoping to (20) ______ money put in small red envelopes as they are wishing longevity to their grandparents and parents. Wrong doings (21) ______ be absolutely avoided on these days. A: ought B: need C: have D: should 9 Choose the best answer A, B, C or D to complete the sentence. Question 11. She is bad and always wants to hurt people. She is __________. A: harmful B: kind C: moral D: evil 10 Choose the best answer A, B, C or D to complete the sentence. Question 12: People burn incense to show respect to their__________ during Tet. A: ancestors B: neighbours C: friends D: relatives 11 Mark the letter A, B, C or D on your answer sheet to indicate the most suitable response to complete each of the following exchanges. Question 14. “Good morning. Can I ask you some questions about this festival?” “___________” A: No, thanks. B: Yes, of course. C: That’s right. D: Never mind 12 Choose the best sentence which has a similar meaning to the given one. Question 22. Lang Lieu was very poor, so he couldn’t buy any special food. A: Lang Lieu couldn’t buy any special food because of be very poor. B: Lang Lieu couldn’t buy any special food because being poor. C: Lang Lieu couldn’t buy any special food because of he was very poor. D: Lang Lieu couldn’t buy any special food because he was very poor. 13 Choose the best answer A, B, C or D to complete the sentence. Question 9. This is the first time she _______ to the Hung King Temple festival. A: is B: was C: has been D: will be

Các bạn giúp mình làm các câu này vớiiii, cần lời giải thích nữa nhé Câu 22 --->25 trong hình Question 26: I’m sure Luisa was very disappointed when she failed to get the scholarship. A. Luisa must be very disappointed when she failed to get the scholarship. B. Luisa must have been very disappointed when she failed to get the scholarship. C. Luisa may be very disappointed when she failed to get the scholarship. D. Luisa could have been very disappointed when she failed to get the scholarship. Question 27: “You had better see a doctor if the sore throat does not clear up”, she said to me. A. She reminded me of seeing a doctor if the sore throat did not clear up. B. She ordered me to see a doctor if the sore throat did not clear up. C. She insisted that I see a doctor unless the sore throat did not clear up. D. She suggested that I see a doctor if the sore throat did not clear up. Question 28: Without her teacher’s advice, she would never have written such a good essay. A. Her teacher advised him and she didn’t write a good essay. B. Her teacher didn’t advise her and she didn’t write a good essay. C. She wrote a good essay as her teacher gave her some advice. D. If her teacher didn’t advise her, she wouldn’t write such a good essay. Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combineseach pair of sentences in the following questions. Question 29: She tried very hard to pass the driving test. She could hardly pass it. A. Although she didn’t try hard to pass the driving test, she could passit. B. Despite being able to pass the driving test, she didn’t passit. C. No matter how hard she tried, she could hardly pass the driving test. D. She tried very hard, so she passed the driving test satisfactorily. Question 30: We didn’t want to spend a lot of money. We stayed in a cheap hotel. A. Rather than spending a lot of money, we stayed in a cheap hotel. B. In spite of spending a lot of money, we stayed in a cheap hotel. C. We stayed in a cheap hotel, but we had to spend a lot of money. D. We didn’t stay in a cheap hotel as we had a lot of money to spend.

giải phương trình (x+5)(4x-1)+x 2 -25 =0