47. Cho 5,6 gam CaO vào H2O dư thu được dung dịch A.Sục V lít (đktc)SO2 vào dung dịch A thu được 1,2 gam kết tủa. Tính V 48. Hấp thụ V lít SO2(đktc) vào 0,25 lít dd NaOH 3,124M thu được 79,338g 2 muối. Tính khối lượng mỗi muối.

GIÚP MK BÀI NÀY VỚI Ạ!!!!!!!!! Cho a = $x^{2}$ +$x^{}$ + 1; b = 2x + 1; c = $x^{2}$ - 1. Giả sử a,b,c là ba cạnh của một tam giác. CMR tam giác đó có một góc bằng $120^{0}$

Nhà máy nào sau đây ở Đông Nam Bộ sản xuất điện và phân đạm? A: Phú Mĩ. B: Thác Mơ. C: Trị An. D: Thủ Đức.

Đây là loại vây gì? A.Vây bụng B. Vây ngực C. Vây bên D. Vây lưng

2 câu thơ đầu trong khổ đầu của bài thơ mùa xuân nho nhỏ tác giả sử dụng biện pháp nghệ thuật gì? nêu tác dụng của biện pháp nghệ thuật đó ? trong chương trình ngữ văn 9 cũng có nhiều tác giả sử dụng nghệ thuật này , hãy chép lại câu thơ có nghệ thuật đó và nêu rõ tên tác giả

cho hinhtam giac co S 5/8 m2 va chieu cao 1/2 m Tinh doc dai day hinh tam giac do

tính nguyên hàm sau: 2x. ln(x-1)dx Giúp Mình với. Cảm ơn nhìu.

MULTIPLE CHOICE 1. The tiger succeeded in __________from the farmer. A. freeing B. running C. getting D. going 2. Little Pea was very happy with the _______of the fairy. A. equipment B. escape C. precaution D. appearance 3. The cattle are eating grass in the field. They are _______. A. feeding B. working C. swallowing D. grazing 4. He was late, but _________his friends waited for him. A. luckily B. magically C. lately D. cruelly 5. We can’t stand people who are cruel ________animals. A. about B. to C. with D. on 6. Our pupils are _________ about the holidays. A. excited B. upset C. annoyed D. sociable 7. My grandfather often wears ________clothes on New Year’s Day A. mobile B. traditional C. magical D. straight 8. When did the prince fall in love __________the princess? A. to B.at C. with D. for 9. After his wife died, he married again. He __________. A. reoccupied B. remarried C. repeated D. rearranged 10. ______________ is necessary, it helps you practice the words more times. A. Revision B. Repetition C. Rearrangement D. Recognition 11. You can focus on important words by underlining or ________________ them. A. highlighting B. marking C. noting D. A & B are correct 12. _______________ is the study of the life of animals and plants. A. Biology B. Chemistry C. Literature D. Civics 13. So they _____________ a piece of paper on which new words with their meaning and use are written everywhere in the house to learn it at any time. A. put B. stick C. get D. post 14. There are different ______________ of learning new words. A. methods B. ways C. processes D. all are correct 15. Some people write a list of new words with the meaning in their _________________. A. explanation B. mother tongue C. mother language D. translation 16. Don’t try to learn all the new words you __________________ in a day. A. get into B. get by C. come across D. come into 17. Some people think that learning vocabulary ____________ is the best way. A. by mind B. in mind C. by heart D. with heart 18. He tried to give up smoking, but he couldn’t break the _________________. A. pastime B. habit C. favor D. hobby 19. We were born in Vietnam, Vietnamese is our _________________. A. first language B. mother tongue C. foreign language D. A & B are correct 20. He arrived early __________________ a good seat. A. so that getting B. so that to get C. in order to get D. in order get 21. _______________ is the study of the earth and its countries, mountains, rivers, weather, etc. A. Geography B. Chemistry C. Mathematics D. Physics 22. Can you ___________ what time the train leaves? A. find out B. find up C. find on D. find in 23. I made some interesting ______________ about the film. A. comments B. commences C. commends D. commenting 24. To remember new words, you have to __________ them often. A. rewrite B. replace C. revise D. repeat 25. After every study term of semester students usually receive their __________. A. marks B. grades C report card D. report book 26. Through that report card they’ll know what subject they need_________. A. to study B. to improve C. to complete D. to finish 27. However he had problems with Spanish ________, because some of Spanish sounds are really hard. A. vocabulary B. grammar C. pronunciation D. spelling 28. ___________it rained heavily, all the members of the young pioneers club still came on time. A. Because B. Although C. Until D. As 29. She can neither speak nor hear. She is a ________ child. A. blind B. deaf C. handicapped D. deaf-mute 30. We received 100 _____________ for that job. A. applications B. favors C. hobbies D. activities 31. You need to __________ before the end of August. A. join B. enroll C. participate D. encourage 32. We like _____________ activities such as fishing and camping. A. outdoor B. inside C. indoor D. outside 33. “May I help you?” – “___________________” A. How can I help? B. What can I do for you? C. Yes. That’s very kind of you D. I’m afraid I’m busy now. 34. The _________ is the land, water and air that people, animals and plants live in. A. environment B. program C. community D organization 35. If you want to join the club, you’ll need to fill _________ an application form. A. at B. on C. to D. out 36. He collects stamps as a _____________. A. pastime B. hobby C. favor D. result 37. We refused to ______________ her as a member of the club. A. encourage B. raise C. recycle D. enroll 38. She is studying hard __________ the final exams. A. but for passing B. in order to pass C. so as pass D. so that she pass

Mn giúp em với Câu hỏi: Trong lịch sử xã hội loài người,nhà nước xuất hiện khi nào?Tại sao khi đó nhà nước xuất hiện?

số tiền mua 1 quả dưa và 1 quả thanh long là 25 nghìn đồng. số tiền mua 5 quả dưa và 4 quả thanh long là 120 nghìn đồng. hỏi giá mỗi quả dưa và mỗi quả thanh long bao nhiêu ?