mọi người ơi help mik 3 bài này với.ai xong vote cho 5* nhá+CTLHN.plz help me cảm ơn !!!!!!

Đồng có 2 đơn vị 63Cu (69,1 %) và 65Cu. nguyên tử khối trung bình của đồng là

help vb thứ 22222222222222 uhuhuh

1. Choose the best answer to complete the conversation. Linda: Hi, David. What's the next (1).....................? A. lesson B. timetable C. hour D. unit David: Hello. Wait, wait. Just a moment. Let me have a look at my (2)............... . A. class B. grade C. plan D. timetable Linda: Oh, history – my favourite (3)...................... . A. knowledge B. study C. matter D. subject David: I usually like History, but I didn't care much last year because we did nineteenth century European history. It was (4)..................... . A. interesting B. boring C. interested D. bored Linda: We're studying Roman Empire this year, and I'm also taking a (5)..................... in Archaeology at evening school. A. lesson B. period C. course D. class David: It's pity that Archaeology isn't included in the (6)..................... here. A. curriculum B. topic C. schedule D. school Linda: Really? Hope to take it some day. G'bye. See you. David: OK. So long.

Giải chi tiết ra giúp mk với ạ, mk cảm ơn

nếu ta nhân số 12345679 với một số a bất kì có một chữ số , rồi nhân kết quả đó với 9 thì ta được số có 9 chữ số mỗi chữ số đều là a chẳng hạn khi a= 3 thì 12345679 nhân 3 = 37037037 37037037 nhân 9 = 333333333 Em hãy giải thích tại sao

. Fill each gap in the passage with a suitable word from the box. memory, morning, filmed, because, nervous, smile, outside, remember I particularly (1)...................... my first day at secondary school. It's very clear in my (2)...................... I was very, very (3)...................... in the morning ... and my friend and I, we went out of our house (4)...................... we lived next door of each other, and we were walking down the road, it was a Monday (5)......................, in September ... how long ago? It was in 1990 and my mother came (6)...................... with me and she took out a video camera and (7)...................... me as I walked down the road, and I turned round and waved ... um ... I was very nervous but I had a big (8)...................... I got to school and everything was fine, but recently she has shown me the video that she took and it was very embarrassing.

Nội dung nào dưới đây không phải là nguyên nhân các nước đế quốc xâm lược và tranh chấp thuộc địa A. Nơi cung cấp nguyên liệu nguồn nhân công rẻ mạt B. Thuộc địa là nơi đầu tư tiêu thụ hàng hóa chính quốc C. Thuộc địa có vị trí thuận lợi cho việc giao lưu buôn bán D. Vì các nước đế quốc cần nguyên liệu để phát triển kinh tế

Mình đi có nhớ những ngày Mưa nguồn suối lũ, những mây cùng mù Mình về có nhớ chiến khu? Miếng cơm chấm muối, mối thù nặng vai? Mình về, rừng núi nhớ ai Trám bùi để rụng, măng mai để già. Mình đi có nhớ những nhà Hắt hiu lau xám , đậm đà lòng son. Mình về còn nhớ núi non Nhớ khi kháng Nhật, thuở còn Việt Minh Mình đi, mình có nhớ mình Tân Trào, Hồng Thái, mái đình, cây đa? 4.4. Nhận xét về âm hưởng đoạn thơ?

1. Complete the sentences with the information from the passage. 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 in Greece, many parents complained about the difficult homework which teachers gave to their children. The 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 weekend. 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. 1. According to many parents, children .............................. to do homework in their free time. 2. Parents think that homework is unnecessary because ...................................... properly. 3. Greek parents find homework so .............................. for ............................... . 4. Children in Turkey ............................................... any homework now. 5. British children can do homework .................................... .