Cho 5,4g một kim loại hóa trị III tác dụng vừa đủ với dung dịch axit HCl thu đc 26,7g một muối đồng thời thấy có khí hidro thoát ra. Xác định kim loại

Chủng tộc nào ở châu Á chiếm tỉ lệ lớn nhất?

Giúp em câu này ạ. Câu hỏi: Tại sao nói Quang Trung đã đặt nền tảng cho việc thống nhất đất nước?

Một người lái xe trong ba giờ đầu ,mỗi giờ đi được 40,5 , trong 2 giờ sau mỗi giờ đi được 40 km , hỏi trung bình mỗi giờ người đó đi được bao nhiêu km

Chứng minh :1/2 mũ 2+1/2 mũ 3+1/2 mũ 4+......+1/2 mũ n <1

Read the passage carefully, then choose the correct answers. The latest addiction to trap thousands of people is the Internet, which has been blamed for broken relationships, job losses, financial ruin, and even suicide. Psychologists now recognize Internet Addiction Syndrome (IAS) as a new illness that could cause serious problems and ruin many lives. IAS is similar to other problems like gambling, smoking and drinking: addicts have dreams about the Internet; they need to use it as the first thing in the morning; they lie to their parents and partners about how much time they spent online; they wish they could cut down, but are unable to do so. A recent study found that many users spend up to 40 hours a week on the Internet. Some of the addicts are teenagers who are already hooked on computer games and who find it very difficult to resist the games on the Internet. Internet addicts find it hard ___________. A: to spend more time on the Internet B: to spend less time on the Internet C: to lie about the time they spent online D: to use the Internet in the morning 3 Read the passage carefully, then choose the correct answers. The latest addiction to trap thousands of people is the Internet, which has been blamed for broken relationships, job losses, financial ruin, and even suicide. Psychologists now recognize Internet Addiction Syndrome (IAS) as a new illness that could cause serious problems and ruin many lives. IAS is similar to other problems like gambling, smoking and drinking: addicts have dreams about the Internet; they need to use it as the first thing in the morning; they lie to their parents and partners about how much time they spent online; they wish they could cut down, but are unable to do so. A recent study found that many users spend up to 40 hours a week on the Internet. Some of the addicts are teenagers who are already hooked on computer games and who find it very difficult to resist the games on the Internet. The word ‘it’ in paragraph 2 refers to ___________. A: computer B: IAS C: dream D: the Internet 4 Choose the underlined part A, B, C or D that needs correcting. Picture 4 A: A B: B C: C D: D 5 Choose the word whose underlined part is pronounced differently from the others. A: out B: sound C: enough D: found 6 Read the passage carefully, then choose the correct answers. The latest addiction to trap thousands of people is the Internet, which has been blamed for broken relationships, job losses, financial ruin, and even suicide. Psychologists now recognize Internet Addiction Syndrome (IAS) as a new illness that could cause serious problems and ruin many lives. IAS is similar to other problems like gambling, smoking and drinking: addicts have dreams about the Internet; they need to use it as the first thing in the morning; they lie to their parents and partners about how much time they spent online; they wish they could cut down, but are unable to do so. A recent study found that many users spend up to 40 hours a week on the Internet. Some of the addicts are teenagers who are already hooked on computer games and who find it very difficult to resist the games on the Internet. What is the best title of the passage? A: Impact of Internet on teens B: A guide to the Internet C: The advantage of the Internet D: Hooked on the Net

8 người làm xong 1 đoạn đường trong 6 ngày.câu hỏi là 4 ngày thì cần mấy người để làm xong đoạn đường.

V. Use the correct form of the verbs: Yesterday (be)………. Sunday, Nam (get)……………up at six. He (do) ………..his morning exercises. He (take) ……………a shower, (comb)…………..hair, and then he (have) ………….. breakfast with his parents. Nam (eat)………… a bowl of noodles and (drink) ………a glass of milk for his breakfast. After breakfast, he (help) …………..Mom clean the table. After that, he (brush)………. his teeth, (put)………. on clean clothes, and (go)………… to his grandparents' house. He (have) …………..lunch with his grandparents. He (return) to his house at three o'clock. He (do)…………..his homework. He (eat)………. dinner at 6.30. After dinner, his parents (take)………. him to the movie theater. It (be)……………a very interesting film. They (come) …………..back home at 9.30. Nam (go)………………. to bed at ten o'clock. 1. What day was yesterday? …………………………………………………………………… 2. What time did Nam get up? ………………………………………………………………… 3. What did he do after breakfast? ………………………………………………………………. 4. Who did he have lunch with? ………………………………………………………………... 5. What time did he have dinner? ……………………………………………………………….. 6. What time did Nam go to bed ? ……………………………………………………………… VI. Write complete sentences. Use the past simple of the verbs. 1. I/ go swimming/ yesterday. =>................................................................................................................................................. 2. Mrs. Nhung/ wash/ the dishes. =>................................................................................................................................................ 3. my mother/ go shopping/ with/ friends/ in/ park. =>................................................................................................................................................ 4. Lan/ cook/ chicken noodles/ dinner. =>............................................................................................................................................... 5. Nam/ I/ study/ hard/ last weekend. =>................................................................................................................................................ 6. my father/ play/ golf/ yesterday. =>............................................................................................................................................... 7. last night/ Phong/listen/ music/ for two hours. =>.............................................................................................................................................. 8. they/ have/ nice/ weekend. =>............................................................................................................................................... 9. she/ go/ supermarket yesterday. =>.............................................................................................................................................. 10. We/ not go/ school last week. =>.............................................................................................................................................

Đại cáo bình Ngô có sự kết hợp hài hòa yếu tố chính luận và yếu tố văn chương, anh (chị) hãy phân tích để làm sáng tỏ nhận định này về các mặt: kết cấu, lập luận, nghệ thuật sử dụng từ ngữ, xây dựng hình tượng, nghệ thuật sử dụng câu văn, nhịp điệu.

Liên Xô,các đồng minh Mĩ,Anh, nhân dân các dân tộc có vai trò như thế nào trong việc tiêu diệt chủ nghĩa phát xít, kết thúc Chiến tranh thế giới II