Chứng minh các biểu thức sau không phụ thuộc vào giá trị của biến a, x ( 2x + 1) - x^2 ( x +2 )+ x^3 - x + 3 b, x (x^2 + x + 1 ) - x^2 ( x + 1 ) - x + 5 c, x 4 ( 6 - x ) + x^2 ( 2 + 3x ) - x ( 5x - 4 ) + 3x^2 ( 1 - x ) Giúp em zoii moi nguoi ưiii =((

giúp em với mọi người ơi 8. He regretted not having followed his advisor’s recommendation that he ……….the class. a. dropping b. might drop c. drop d. dropped 9. The committee recommended that the company …………..in new property. a. must invest b. could invest c. invested d. invest 10. He insists that a meeting …………..as soon as possible. a. would be held b. be held c. is held d. hold 11. The clients demanded that the doctor’s office ………………earlier a. opening b. opened c. open 12. What would you suggest that he ………………..? d. to open a. will do b. would do c. do 13. It is necessary that he ………………a certificate in English? d. did a. will get b. gets c. get 14. I demand that I …………….to retake the exam. d. would get a. be allowed b. am allowed c. will be allowed 15. It is imperative that the crew ……………….the ship before it is too late d. were allowed a. should leave b. leave c. A-B 16. It is our wish that she …………………..in her life. d. should be left a. succeeds b. succeed c. succeeded 17. The king ordered that Gulliver ………………..set free. d. will succeed a. be b. is c. will be 18. It is essential that Mary ………………..speak English. d. would be a. be able to b. is able to c. was able to

Fill in the blank with ONE correct word from the list moving earthquake away Although because A powerful ___________(1)struck the north-east of Japan at 4 p.m. last Monday. _________(2)Japan has the most advanced warning system, there had been no early warning for this one and people were not prepared. Suddenly the ground started __________(3). The shaking continued for a few minutes and became stronger. People began running ________(4) from buildings as walls started to collapse. Help!

Câu 13: Tính phần trăm khối lượng của mỗi chất trong hỗn hợp: 1) 500 ml dung dịch X gồm HCl 0,5M và H2SO4 0,2M. 2) 800 ml dung dịch X gồm NaCl 0,2M và NaNO3 0,5M 3)8,96 lít hỗn hợp khí X ở đktc gồm O2 và CO2, trong đó có 2,24 lít khí O2. 4) 11,2 lít hỗn hợp khí X ở đktc gồm NO và NO2, trong đó có 4,48 lít khí NO Giải giúp e vs

BaO(r) + H2O → Ba(OH) cho e hỏi "(r)" ở pt trên nghĩa là j ạ?

Burn – out land (n) Altenating song (n) Dịch giúp e vs ạ!owo

1. That umbrella is ....... A. our B. our's C. ours D. to our 2. What ....... to the beggar? A. did happen B. was happened C. happening D. happened 3. Please smoke in the ....... room. A. smoke B. smokes C. smoking D. smoked 4. We've got ....... food in the house. A. plenty of B. plenty C. lots D. very much 5. Up to now I ....... a lot of information about her. A. would learn B. have learnt C. have learn D. will learn 6. Mrs Smith, ....... husband is a diplomat, gives cooking lessons. A. whom B. who C. whose D. who's 7. He was arrested. He ....... A. escaped B. was caught C. was stopped D. was seen 8. He heard a noise ....... coming from the bar. A. which was B. who was C. that is D. which is 9. I live a few yards ....... the bus stop. A. off B. away C. from D. with 10. We ....... in this village 10 years ago. A. have lived B. were living C. used to live D. lived

Vẽ đậu mầm :< các anh chị ơi , cấp 3 thế nào thế có phải chuẩn bị tinh thần trước không chuẩn bị những gì ? cho em xin thỉnh giáo với .

ai rảnh ko cứuuuuuuuuuuuuuuuuuuuuuuuuu

vai trò của quá trình quang phân li nước