Xác Đinh công thức hoá học của X Biết X chứa 39,13% cacbon, 8,70% hiđrô và 52,17% oxi về khối lượng và tỉ khối hơi của X so với khí oxi là 2,875
Trong các chất dưới đây, chất nào không phải là chất cách điện? Cao su.Than chì.Gỗ khô.Nhựa. Câu 9: Dụng cụ nào dưới đây hoạt động chủ yếu dựa vào tác dụng nhiệt của dòng điện? Máy vi tính.Máy bơm nướcBàn là điện.Quạt điện.
16. I can’t cook as well as my mother does. A. My mother cook better than I am. B. My mother is a better cook than I am. C. My mother cooks as well as I do. D. My mother is a worse cook than I am. 17. Lan has collected far more coins than her brother has A. Lan’s brother has collected no more coins than her. B. Lan’s brother has collected more coins than her. C. Lan’s brother has collected far fewer coins than her. D. Lan’s brother hasn’t collected as many coins as her. 18. We’ve never seen a prettier firework display before. A. This firework display isn’t as pretty as those we’ve seen. B. This is the prettiest firework display we’ve ever seen. C. This firework display is prettier than some we’ve ever seen. D. This is one of the prettiest firework displays we’ve ever seen. 19. Ho Chi Minh is the largest city in Viet Nam. A. No other city in Viet Nam is as large as Ho Chi Minh. B. Ho Chi Minh is as large as other cities in Viet Nam. C. All the cities in Viet Nam are large. D. All the cities in Viet Nam are larger than Ho Chi Minh. 20. This is the best music I have ever heard. A. I've never heard better music than this. B. I've ever heard such a good music as this. C. I've ever heard so good music as this. D. This is the first time I've heard this good music. 21. My uncle doesn’t drive so carefully as my aunt. A. My uncle drives more carefully than my aunt. B. My aunt is a more careful driver than my uncle. C. My aunt drives less carefully than my uncle. D. My aunt is a more careful driver as my uncle. 22. Jack plays tennis the best in the club. A. No one can beat Jack at tennis. B. Jack plays tennis better and better. C. Jack plays tennis not worse than anyone in the club. D. No one in the club plays tennis as well as Jack. 23. Helen can play the piano better than Ann. A. Ann is the best player. B. Ann can play the piano as well as Helen. D. Ann can play the piano better than Helen. D. Ann can’t play the piano as well as Helen. 24. He is the most generous man I have ever met. A. I have never met a man like him. B. I have never met such a generous man. C. I have never met a generous man as him. D. He is the most generous man that I met. 25. Nam is better at English than Linh. A. Linh isn’t as bad at English as Nam. B. Nam isn’t as good at English as Linh. C. Nam is worse at English than Linh. D. Linh isn’t so good at English as Nam. 26. China is the largest country in the Asia. A. Any other country in the Asia is larger than Chinese. B. No other country in the Asia is as large than Chinese. C. No other country in the Asia is as large as Chinese. D. If she has much money, she wants to buy a house in Vinhome. 27. The villa painted in pink is not so beautiful as the villa painted in white A. The villa painted in white is as beautiful as the villa painted in pink . B. The villa painted in pink is more beautiful than the villa painted in white. C. The villa painted in white is more beautiful than the villa painted in pink. D. The villa painted in white is not as beautiful as the villa painted in pink 28. Mike doesn’t cook as well as Barbara does. A. Barbara cooks as well as Mike does. B. Barbara cooks better than Mike does. C. Barbara is the best cook of all. D. Barbara doesn’t cook better than Mike. 29. Ankara is only smaller than Istanbul, the biggest city in Turkey. A. Ankara is the second biggest city in Turkey. B. Ankara is bigger than Istanbul. C. Ankara is the biggest city in Turkey. D. Ankara is as big as Istanbul. 30. The books in Chinese are not so expensive as the books in English. A. The books in English are more expensive than those in Chinese B. The books in English are more expensive than Chinese. C. The books in English are more expensive than in Chinese. D. The books in English are more expensive than that in Chinese.
Bài 4: Cho hai đường thắng AB và CD cắt nhau tạo O. Vẽ tia phân giác Om của góc BOC. Gọi On là tia đối của tia Om. Chứng minh: a, Tia On là tia phân giác của góc AOD b, Gọi Op là phân giác của góc BOD. Chứng minh Op vuông góc On Các senpai giỏi toán giúp em với ạ
Mọi người giúp mình câu 40 với ạ
Tìm 3 giá trị của x sao cho a,2,01<x2.02 b,7<.x0.07<14 dấu chấm là dấu nhân
cho số hữu tỉ x = $\frac{6n+5}{2n-1}$ tìm n ∈ Z để x ∈ Z
Khí hậu ở các môi trường địa lí đã ảnh hưởng đến số lượng loài động vật như thế nào?
Calli: Cục súc Nl: ủa lạ đời v? trl câu dễ đc hn thế gọi là buff à?
Câu 4: Sục 6,72 lít khí CO2 vào 100 ml dung dịch Ca(OH)2 aM thu được m gam kết tủa. Sục 8,96 lít CO2 vào 100 ml dung dịch này thì lượng kết tủa thu được vẫn là m. Tính a?
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