Bài 156 là phân tích đa thức thành nhân tử bằng phg pháp dùng hằng đẳng thức nha

Hòa tan hoàn toàn 10,4 gam hỗn hợp X gồm Mg, Fe vào dung dịch HCl 10% (vừa đủ) thoát ra 6,72 lít khí (đktc) A, Tính % khối lượng mỗi kim loại trong hỗn hợp B, Tính khối lượng dung dịch axit đã dùng C, Tính C% chất tan trong dung dịch sau phản ứng

Bài 1: Phân tích đa thức thành nhân tử 1)3y^2 (x-7)-9y(7-x) 2)3x(x-2)-6x+12 3)25x^4-49 4)25x^2-y^2-4x-4 Bài 2: a) Chứng minh rằng (5n-2)^2-(2n-5)^2 luôn chia hết cho 21 với mọi . b) Cho biết a^2+b^2=1-2ab và a>0,b>0. Tính giá trị của biểu thức: C=a^3+b^3+3ab c) Chứng minh biểu thức không phụ thuộc vào biến x. T=(x^2+x+1)(x^2-x+1)(x^4-x^2+1)-x^8-x^4

III. GERUNDS AND INFINITVES 1. Don’t forget (phone) your mother. 2. I love (be) on my own and (listen) to music. 3. Do you want (go out) tonight? 4. Would you like (go) to the beach this afternoon? 5. I remembered (lock) all the doors but I forgot (turn off) the lights. 6. Are you planning (go) on holiday this year? 7. He agreed (see) me after I wrote him a letter. 8. I enjoy (read) your letters very much. 9. We like (live) here but we miss (talk) to our old friends. 10. I’d like (get) a job with a foreign company.

Mn giúp mik vs ạ mik cảm ơn trước mik hứa vost 5 sao và ai xong trước sẽ đc qtlhn ạ e cảm ơn

Ở Đậu Hà lan, khi cho lai hai cây hoa đỏ lưỡng bội với nhau, người ta thấy ở F1 xuất hiện cây hoa trắng. Biết rằng mỗi gen quy định một tính trạng, gen nằm trên nhiễm sắc thể thường không xảy ra hiện tượng đột biến. a) Hãy biện luận và viết sơ đồ lai. b) Nếu các cây hoa đỏ F1 tiếp tục tự thụ phấn thì tỉ lệ phân li kiểu hình sẽ như thế nào? c) Nếu cho các cây hoa đỏ ở F1 giao phối ngẫu nhiên với nhau. Xác định kết quả ở F2.

Question 2. A. hand B. bad C. hat D. age Mark the letter A, B, C, or D to indicate the word that differs from the other three in the position of primary stress in each of the following questions. Question 3. A. confide B. divide C. answer D. appeal Question 4. A. develop B. reunite C. understand D. recommend Mark the letter A, B, C, or D to indicate the correct answer to each of the following questions. Question 5. The children were very tiresome, ? A. weren't they B. wasn't they C. didn't they D. don't they Question 6. The 26th Annual Meeting of the Asia-Pacific Parliamentary Forum (APPF) in Hanoi from January 18th to 21st, 2018. A. was held B. held C. being held D. will hold Question 7. Affected by the Western cultures, Vietnamese people’s attitude love and marriage have dramatically changed. A. for B. with C. through D. towards Question 8. The more tired you are, it is to concentrate. A. the harder B. harder C. hardest D. the hardest Question 9: the storm, the ship couldn't reach its destination on time. A. Because of B. In case of C. In spite of D. But for Question 10: By the time you come here tomorrow, the work . A. will have been finishing B. will be finishing C. will have been finished D. will be finished Question 11: He has been very interested in doing research on since he was at high school. A. biology B. biological C. biologist D. biologically Question 12: I applied for the job but was . A. taken away B. got over C. turned down D. turned off Question 13: Linh is that she can't sit up. A. sick enough B. too sick C. such sick D. so sick Question 14: Her parents were very proud her when she got the scholarship. A. at B. on C. of D. in

hộ mik với ạ mik đag cần gấp lắmmmm

Giúp mình nhaa 1. Certain problems have….., so the meeting has been cancelled. (risen / aroused / roused / arisen) 2. The plan for the reform has been…..by the council. (set back / put away / brought down / held up) 3. Whether to abolish corporal punishment in schools is still a…..of contention. (head / bone / leg / body) 4. He said he would contribute money, but later he…..out of it. (dropped / came / drawn / backed) 5. In spite of the anesthetic, he was fully…..during the operation. (awake / conscious / aware / sensitive) 6. The doctor showed the new nurse…..to do. (what / how / when / where) 7. If you make an appointment, it will save you….. (from waiting / waiting / for waiting / at waiting) 8. At this hour the street is…..as everyone is fast asleep. (abandoned / emptied / deserted / isolated) 9. Two…..in his argument for his defense are worth a mention. (notices / points / effects / reports) 10. I shall do the job to the best of my….. (capacity / ability / knowledge / talent) 11. The production comes along well, although there were some…..at the very beginning. A. teething troubles B. starting problems C. last straws D. nutshells 12. When journalists…..they can put themselves in considerable danger. A. vote with their feet B. get to the point C. are in the bag D. go under cover 13. You’ll recognize Jenny when you see her. She…..a red hat. A. wears B. is wearing C. will be wearing D. will wear

giúp mình với, mình đang cần gấp ạ.