hợp chất X có %c= 54,545, %h= 9,1%,còn lại là O2.D X/H=44 , Xác định CTPT

viết đoạn văn khoảng 10-12 câu theo hình thức tổng phân hợp nêu cảm nhận về tâm trạng người tù qua khổ thơ cưới bài Khi con tu hú

theo em chúng ta phải có thái độ thế nào đối với người nhiễm HIV/ AIDS và gia đình họ

Mark the letter A, B, C or D on your answer sheet to indicate the meaningful sentence from the cues given. Although / he /tired / he / have to / finish / homework. A: Although he is tired, he has to finish his homework. B: Although he is tired, he have to finish the homework. C: Although he tired, he has to finish the homework. D: Although he was tired, he has to finish his homework. Mark the letter A, B, C or D on your answer sheet to indicate the word whose underlined part differs from the other three in pronunciation in each of the following questions. A: hair B: happen C: honor D: house 3 Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions. Many people now think that teachers give pupils too much homework. They say that it is unnecessary for children to work at home in their free time. Moreover, they argue that most teachers do not properly plan the homework tasks they give to pupils. The result is that pupils have to repeat tasks, which they have already done at school. Recently many parents complained about the difficult homework which teachers gave to their children. The Greek parents said that most of the homework was a waste of time, and they wanted to stop it. Spain and Turkey are two countries, which stopped homework recently. In Denmark, West Germany and several other countries in Europe, teachers cannot set homework at weekends. In Holland, teachers allow pupils to stay at school to do their homework. The children are free to help one another. Similar arrangements also exist in some British schools. Most people agree that homework is unfair. A pupil who can do his homework in a quiet and comfortable room is in a much better position than a pupil who does his homework in a small, noisy room with the television on. Some parents help their children with their homework. Other parents take no interest at all in their children’s homework. It is important, however, that teachers talk to parents about homework. A teacher suggests suitable tasks for parents to do with their children. Parents are often better at teaching their own children. According to many parents, _____. A: children shouldn’t be given marks for homework B: teachers do not set enough homework. C: children are too lazy to do D: a lot of homework has not been planned properly

Cho 150 gam dung dịch HC1 7,3 % tác dụng vừa đủ với dung dịch Na:CO: 5,3 % a. Tính khối lượng dung dịch Na:CO3 đã dùng. b. Tính khối lượng muối tạo thành và thể tích khí thu được sau phản ứng ở đkte

làm hộ mk nha cảm ơn các bạn 1 bài thôi

Mn giải giúp e với ạ Cảm ơn mn

Mọi người giải chi tiết cho e câu f vs g với ạ

Truyền công suất điện 50kW có hiệu điện thế 220V đi xa bằng dây tải có điện trở 12 ôm. Tính công suất hao phí? Để giảm hao phí xuống 9 lần thì phải làm thế nào?

HUHU ANH EM ĐÂU HÊT RÒI VÔ ĐÂY GIÚP TUI BÀI NÀY ZỚI!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Đề:Tính: a,28% của 376 b,9% của 12 MN CỐ LÊN GIÚP TUI NHÁ~~~~~~~~~~~~~~~~~~~~~!!!!!!!!!!!!!