Cho 45.9 gam $BaO$ tan hoàn toàn trong nước thu được dung dịch A. Mặt khác người ta lấy 36.8 gam hỗn hợp gồm $CaCO_{3}$ , $MgCO_{3}$ tác dụng với một lượng vfwa đủ dung dịch $HCl$ thu được khí B. Hỏi nếu cho khí B hấp thụ hoàn toàn vào dung dịch A thì có kết tủa không ? Vì sao ?

People believe that this new teaching method is more effective than the old one => This new teaching method _________________________________.

ài : ắp xếp từ thành câu hoàn chỉnh: 37. you/ school/ at/ Are/ now/ ?  _______________________________________________ 38. lessons/ How/ you/ do/ today/ many/ have/ ?  __________________________________________________________________ 39. IT/ have/ Do/ today/ you/ ?  __________________________________________________ 40. four/ Vietnamese/ a/ He/ week/ times/ has/ .

1.Tính a.(√8-3√2).√2 b. $\frac{√14-√7}{1-√2}$ 2.Rút gọn biểu thức a. √19+√136 - √19-√136 lưu ý: căn 136 nằm trong căn 19 nha

ài : . Đọc đoạn v n, chọn từ ph hợp điền vào chỗ trống: online pretty lessons singing times My name is Quynh. It is Friday today. I am at school now. I have three (28) ____________: Vietnamese, English and Music. I have English three (29) _________ a week. My English teacher is Miss Loan. She is a (30) ___________ and great teacher. English is one of my favorite subjects because I love (31) ______________ English songs. I also like talking with foreign friends (32) ____________. . Đọc lại đoạn v n r i trả lời các câu hỏi sau: 33. Is Quynh at school now?  _____________________________________________________ 34. How many lessons does she have today?  __________________________________ 35. How often does she have English?  _________________________________________ 36. What’s her favorite subject?  _________________________________________________

Một vật hình hộp chữ nhật có kích thước(30*20*10cm). a) Tính thể tích của vật. b) Tính lực đẩy Ác-si-mét tác dụng lên vật khi thả đứng nó vào trong chất lỏng có trọng lượng riêng 12000N/m3. Biết vật chìm hoàn toàn trong chất lỏng.

Làm nhanh hộ mình nha! Nhưng cũng cần chất lượng chút😊!

7. He lives in a(n)…………….. cottage in the countryside. A. stone, old, small B. old, small, stone C. small, old, stone D. stone, small, old 8. Look at that boy! He……………..from the tree. A. is going to fall B. goes to fall C. will fall D. falls 9. I wouldn’t advise……………..in the car; you might get dizzy. A. to read B. read C. reading D. to be reading 10. Helen works as……………..volunteer, helping……………..elderly. A. a - an B. the - the C. a - Ø D. a - the 11. Trang……………..into the classroom just as her teacher……………..the lesson. A. was walking - started B. walked – started C. walked - was starting D. was walking - was starting 12. Which of the following is NOT a mammal? A. whale B. frog C. bat D. bear 13. Which ocean does not border North America? A. Atlantic Ocean B. Arctic Ocean C. Indian Ocean D. Pacific Ocean 14. You’ve got an umbrella with you,……………..? A. don't you B. do you C. have you D. haven’t you 15. How many hemispheres are there? A. 1 B. 2 C. 3 D. 4 16. Linh read an interesting……………..of news in the paper. A. piece B. slice C. packet D. block III. Rewrite the second sentence using the given word(s) so that it has a similar meaning to the first sentence. 17. I don’t want to listen to this song again. (BORED) →I’m………………………………………………………………………………………………………. 18. Would you mind lending me your pen? (KIND) → Would you………………………………………………………………………………………………. 19. It is the fastest car he has ever driven. (NEVER) →He……………………………………………………………………………………………………….. 20. Frank is less respectful than his brother. (AS) → Frank…………………………………………………………………………………………………… 21. She spent an hour preparing for the party. (TOOK) →It…………………………………………………………………………………………………………. 22. How fast she runs! (FAST) → What

Cho f(x)=(x-4)-3×(x+1). Tìm x sao cho f(x)=4

1 find the mistake and make it corect It is ten year since we have said goodbye to them A it B have said C to D them 2 Neither the teacher nor his students .....there since the beginning of the school year A has been B are C have been D were giải thích 2 câu luon nha