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calli Nguyễn Trãi không vẽ ở vở có ôli

Câu 6. Cho dung dịch X gồm: 0,007 mol Na+ ; 0,003 mol Ca2+; a mol Cl- ; 0,006 mol NO3 - . a) Tính a. b) Để kết tủa hết ion Ca2+ cần dùng m gam Na2CO3. Tinh m. Câu 7: Tính pH của 200 ml dung dịch Ba(OH)2 0,008M Câu 8: Tính pH của 100 ml dùn dịch H2SO4 0,012M Câu 9: Hòa tan 0,365 gam HCl vào nước được 2 lít dung dịch. Tính pH của dung dịch HCl.

Câu 42. Một viên bi A được thả rơi từ độ cao 30m. Cùng lúc đó, một viên bi B được bắn theo phương thẳng đứng từ dưới đất lên với vận tốc 25m/s tới va chạm vào bi A. Cho g = 10m/s2 . Bỏ qua sức cản không khí.Vận tốc mỗi viên bi khi gặp nhau. A. – 11m/s B. – 12m/s C. – 15m/s D. – 13m/s

Qua tác phẩm " Ngẫu nhiên viết nhân buổi mới về quê" em hãy viết một đoạn văn (khoảng 15 - 20 dòng) nói về nỗi lòng của tác giả khi về quê nhà.

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Mn giúp mik. Hãy chỉ rõ và phân tích tác dụng của biện pháp tu từ được sử dụng trong câu sau : Đó là nơi tiền bạc không quý bằng tình yêu .

Exercise 3 1. They will ask you a lot of questions at the interview. a. You will be asked a lot of questions at the interview. b. You will be asked a lot of questions at the interview by them. a. A lot of questions will be asked you at the interview. d. A lot of questions will be asked at the interview. 2. Nobody told me that George was ill. a. I was told that b. I wasn't told that George was ill c. George wasn't told to be it d. George was told not to be ill 3. His colleagues gave him a present when he retired. a. He was given a present when he retired. b. A present was given by his colleagues when he retired. c. He was given a present by his colleagues when he retired. d. A present was given him when he retired. 4. We will send you the results as soon as they are ready. a. You will be sent the results as soon as they are ready. b. You will be sent the results as soon as they are ready by us. c. The results will be sent you by us as soon as they are ready. d. The results will be sent you as soon as they are ready by us. 5. I think they should have offered Tom the job. a. I think Tom should have been offered the job by them. b. I think Tom should have been offered the job. c. I am thought they should have offered Tom the job. d. I think the job should have been offered Tom 6. They say that many people are homeless after the tsunami. a. They say many people to have been homeless after the tsunami. b. They say many people to be homeless after the tsunami. c. Many people are said to have been homeless after the tsunami. d. Many people are said to be homeless after the tsunami. 7. They know that the Prime Minister is in favour of the new law. a. The Prime Minister is known to have been in favour of the new law. b. They know the Prime Minister to be in favour of the new law. c. The Prime Minister is known to be in favour of the new law. d. They know the Prime Minister to have been in favour of the new law. 8. They expect that the government will lose the election. a. The government is expected to have lost the election. b. The government is expected to lose the election. c. They expect the government to lose the election. d. They expect the government have lost election. 9. They think that the prisoner escaped by climbing over the wall. a. The prisoner is thought to escape by climbing over the wall. b. The prisoner is thought escaped by climbing over the wall. c. The prisoner is thought having escaped by climbing over the wall. d. The prisoner is thought to have escaped by climbing over the wall. 10. They believer that the thieves got in through the kitchen window. a. The thieves are believed to have got in through the kitchen window. b. The thieves are believed to get in through the kitchen window. c. They believe the thieves got in through the kitchen window. d. They believe the thieves have got in through the kitchen window.

Cho biểu thức P = √ ( 1 + $\frac{1}{√x -1}$) . $\frac{1}{x - √x}$ a, Tìm ĐKXĐ và rút gọn P b, Tìm x để P . √ (5+2√6) . $(√x-1)^{2}$ = x - 2005 + √2 +√3