Câu 25:Cách đây 2 năm con 5 tuổi và kém cha 30 tuổi. Hỏi sau bao nhiêu năm nữa tuổi cha gấp 3 lần tuổi con? *

Hộ em phần b, làm theo sơ đồ đường chéo nhá

viết mỗi khối sau dưới dạng tổng hoặc hiệu hai bình phương a, z ²-6z+5-t ²-4t b,x ²-2xy+2y ²-2y+1 c,4x ²-12x-y ²+2y+8

Câu 15: Năm nay mẹ hơn con 25 tuổi. Hỏi sau 10 năm nữa con kém hơn mẹ bao nhiêu tuổi? *

Cửa hàng bán một cái máy tính với giá 5.620.000đồng.Tiền vốn để mua một máy tính đó là 5.000.000 đồng. Hỏi khi bán một máy tính,cửa hành đó lãi bao nhiêu phẩn trăm?

Bài 2: Trộn 10 lít N2 với 40 lít H2 rồi nung nóng một thời gian ở điều kiện thích hợp. Sau một thời gian đưa về điều kiện và áp suất ban đầu thấy thu được 48 lít hỗn hợp gồm N2; H2; NH3. a)Tính thể tích NH3 tạo thành ? b)Tính hiệu suất tổng hợp NH3 ? Giair chi tiết giúp em với ạ Em cảm ơn trc ạ

I. Choose the best answer to complete the following sentences 31. I haven’t seen that coat before. ______ have you had it? A. How B. How old C. When D. How long 32. It’s nice to see you again. We ______ each other for a long time. A. haven’t seen B. hasn’t seen C. didn’t see D. don’t see 33. The girls have ______ gone to the cinema. They won’t be back until ten o’clock. A. since B. still C. yet D. just 34. I haven’t seen my parents ______ last Christmas. A. already B. for C. before D. since 35. This is the first time I ______ away from home. A. lived B. have ever lived C. lives D. has lived 36. This program must be new. I’ve ______ seen it before. A. ever B. since C. for D. never 37. ______ you ______ a holiday this year? A. Have / had B. Did / have C. Do / have D. Has / had 38. I wish this school ______. A. were bigger B. is bigger C. are bigger D. was bigger 39. I don’t think Jane will leave this Sunday. I wish she ______. A. won’t B. will C. wouldn’t D. isn’t 40. My house ______ broken into last night. A. are B. is C. was D. were 41. The meal ______ cooked when I came. A. was be B. was being C. is D. is being 42. How ______ this word ______? A. is / pronounced B. are / pronounced C. were / pronounced D. is / pronounce 43. A lot of money ______ in the robbery. A. were stolen B. were steal C. was stolen D. was stole 44. Do you ever wish you ______ a doctor some day? A. will become B. would become C. becoming D. was 45. When ______ the telephone ______? A. were / invented B. were / inventing C. was / invented D. was / inventing 46. Somebody ______ the car already. A. have cleaned B. clean C. has cleaned D. cleaned 47. She has ______ to Hue University. A. be accepted B. been accepted C. is accepted D. were accepted 48. We have ______ how to cook. A. been teach B. be taught C. been teacher D. been taught 49. My purse ______ yesterday. A. have taken B. was taken C. have took D. is taken 50. The details should ______ carefully. A. is checked B. check C. was checked D. be checked 51. Doctors _____ an answer to AIDS yet. A. have found B. found C. haven't found D. hasn't found 52. Do you mind _____ up? A. wash B. washing C. washed D. to wash. 53. He _____ to give up smoking since last week. A. was trying B. have tried C. has tried D. tried. 54. He enjoys _____ in the rain. A. walk B. walks C. to walk D. walking. 55. Would you like _____ to my party? A. come B. to come C. coming D. came. 56. My sister likes _____ and _____. A. dance/sing B. to dance/sings C.dancing/singing D. dancing/to sing 57. This school _____ ten years ago. A. be built B. is built C. was built D. built 58. He _____ since the day we left school. A. hasn't seen B. hasn't been being seen C. wasn't seen D. hasn't been seen 59. We spent half a year _____ this hotel. A. to build B. built C. building D. with building 60. My friend is fond of _____ TV in the evening. A. watching B. to watch C. watch D. watched 61. There is a _____ on the table. A. lamp reading B. read lamp C. reading lamp D. reading lamps 62. While I _____ TV, my sister _____ to music. A. was watching/ listening B. watched/ listened C. was watching/ was listening D. watching/ listening 63. She is bored _____ getting up early. A. with B. of C. in D. to 64. I am not used _____ up early. A. get B. to get C. getting D. to getting 65. She can't stand _____ her at home all day. A seeing B. see C. to see D. saw 66. He drives very _____ and has got two accidents this year. A. careless B. carefully C. carelessly D. careful 67. You'd better _____ at night. It's dangerous. A. not go out B. don't go out C. to go out D. not to go out 68. I'd rather _____ at home than _____ to see that film. A. stay/ to go B. staying/ going C. to stay/ to go D. stay/ go 69. He was surprised _____ her action. A. for B. with C. to D. at 70. He feels like _____ in a big city. A. live B. to live C. living D. lives 71. They are trying to look _____ new jobs. A. after B. at C. for D. forward

Cho tam giác ABC có AB < AC . Tia phân giác AD . Trên tia đối AC lấy điểm E sao cho AE = AB A ) chứng minh BD = DE B) Gọi M là gđ của AB và ED , CM tam giác BDM = tam giác EDC C) SS BD và DC D, tam giác AMC là tam giác gì ? Cm E) CM AD vuông góc vs MC F) CM BE // MC Sẽ cho ctrlhn và 5* nhưng xin hãy làm đúng và chính xác cảm ơn

Giúpp emm đii, làm đc thì hộ em với, ac cứ lamd từ từ ạ, maii em cần Làm từ c7 thuii nhaa

Viết đoạn văn ngắn nêu suy nghĩ của em về văn bản “Tôi Đi Học”.