Cho P=($\frac{1}{x+3}$ - $\frac{2}{x-3}$ -$\frac{x}{9-x^2}$ ):$\frac{9}{(3-x)(x+1}$ a) Rút gọn P b) tính P khi |2x-1|=3 c)Tìm x để P>1 d)Tìm x để P<0

Question 42-51: In three of the four words, the underlined part is pronounced the same; in the fourth word the underlined part is pronounced differently. Find the fourth word. 42. a. held b. flew c. mend d. tent 43. a. quiet b. industry c. relative d. participant 44. a. nothing b. clothes c. hold d. told 45. a. bear b. ear c. tear d. hear 46. a. lot b. floor c. box d. dog 47. a. small b. law c. tall d. plane 48. a. float b. noun c. about d. out 49. a. arrive b. abroad c. around d. armchair 50. a. snowy b. cold c. prison d. Chicago 51. a. great b. hate c. heat d. afraid Question 52-59: In three of these words the first syllable is stressed. In the fourth the second syllable is stressed. Find the word in which the second syllable is stressed. 52. a. person b. enough c. picture d. people 53. a. Japan b. Australia c. Britain d. Canada 54. a. surprise b. wonderful c. ticket d. evening 55. a. busy b. fortunate c. include d. follow 56. a. depart b. medical c. husband d. business 57. a. volcano b. gallery c. seafood d. windy 58. a. sunny b. facility c. humid d. minus 59. a. weather b. lava c. middle d. delicious

3,45 gam một kim loại kiềm tác dụng với nước thu được 1,68 lít H2 (đktc). xác định tên kim loại kiềm trên

giup mik vs nhaaa mik cam on nhieu

Ai biết giải hộ Mơn các bạn nhìu

Question 21-31: Choose the correct answer. Only one answer is correct: 21. After the clothes……………we can wear them to Ann’s birthday party. a. washing b. wash c. to wash d. are washed 22. A new university without a library……………in USA. a. recently b. opened recently c. recently has opened d. has recently opened 23. Do you know the place…………………..I can have a meal with my friends? a. where b. which c. what d. when 24. On Christmas Eve, people often………..a tree. a. are decorated b. were decorated c. decorating d. decorate 25. …………to your place tomorrow. Hope to meet you there. a. would come b. will come c. am coming d. was coming 26. The can overturned and everyone………………..into the deep river a. fall b. fell c. felt d. feel 27 The games were………………..important that they stopped fighting for a time. a. so b. too c. very d. such 28. This is an emergency. Please ……………………an ambulance to Cua Viet beach a. to sending b. sending c. to send d. send 29. Of the all members in my family, my grandpa is………………….. a. oldest b. the oldest c. most old d. the most old 30. How long……………..here? - Since 1980. a. do you live b. did you live c. have you live d. have you lived 31. We are having a plan to help them by ……………..them do things. a. encouraged b. encourage c. to encourage d. encouraging Question 32-41: Put the verbs in brackets into the correct from: 32. Most of the Earth’s surface (cover)…………..…………..by water. 33. The first festival (hold)………………….….nearly eight hundred years ago. 34. There’s some behind us. I think we (follow)……………………….. 35. My mother (not visit)……………………….us since he (move)…………..……..to the new town. 36. This bike (use)……………………….for more than six years. 37. Nowadays, many historical places (destroy)………….………….seriously. 38. It (get)……………………hotter and hotter in June 39. Last moth when we (visit)………….him, he (do)…………………..…an experiment on the upstairs 40. Tet holiday in Viet Nam (celebrate) ………………………around January and February 41. The Eiffel Tower is in Paris. It (visit)………………………..by millions of people every year.

3: Một người dùng tấm ván đặt nghiêng từ mặt đất lên sàn xe tải cao 1.2 m , để đưa vật nặng có khối lượng 200 kg lên xe. Bỏ qua ma sát: a) Tính chiều dài của tấm ván đó . Biết lực kéo là 600 N. b) Tính công của người đó khi kéo vật lên.

Phân tích đa thức sau thành nhân tử : ( x + 1 ).( x + 3 ).( x + 5 ).( x + 7 ) + 15

3.|x-1/2|=9/2 Mn giúp mk giải va ak

Không nên bơm bánh xe quá căng là sự nở vì nhiệt của chất nào?