Bạn tham khảo nha!
Trung bình cộng của 2 số là:45 -7 = 38Tổng của 2 số là :38 x 2 = 76Số bé là:76 - 45 = 31Đáp số : 31
$x^{2}-2(m-1)x-4m=0$ Khi nào Pt có 2 nghiệm phân biệt? Giúp mình với :<
Nêu kế hoạch đánh chiếm Bắc Kì lần thứ nhất (1873) của thực dân Pháp
I. Tìm lỗi sai và sửa lại. 1.I live in apartment on Nguyen Trai Street. _______ 2.what do you doing tomorrow?. ________ 3.there is some new furnitures in the living room _______ 4.my mother have short curly hair and big blue eyes _____ 5 would you like going to the movies tonight? ______ II. Lối 1. Where does your brother live? a.oh I’d love to! 2. What does he look like? b. He’s a bit boring. He really doesn’t like anything. 3. What’s he like? c .No , thanks. I’m Full 4.What does he like? d . Orange juice , please. 5. Would you like something to eat?e. He’s shortish with dart brown hair. 6. Would you like to have dinner with me on Friday ? f. Yes , sure 7. Can’t you pass me that book, please? g. In Da Nang 8 . What would you like to drink? h. He’s friendly and easy - going
Tính giá trị biểu thức: B=-5/7+2/-7+4/9+4/9 C=(3-3/4+2/3)-(2+4/3-3/2)-(1-7/3-9/2)
Chứng minh ngành công nghiệp dệt may là ngành có vai trò chủ đạo trong ngành công nghiệp sản xuất hàng tiêu dùng
21) When he ____, we ____ dinner. A. arrived/having B. arrived/were having C. was arriving/had D. had arrived/had 22) While they ____ chess, we ____ the shopping. A. playing/doing B. were playing/doing C. played/did D. were playing/were doing 23) They ____ football when the lights in the stadium ____ out. A. were playing/went B. played/was going C. were playing/ was going D. playing/went 24) While George and John ____ their room, she ____ the ironing. A. cleaning/doing B. were cleaning/was doing C. were cleaning/doing D. cleaning/was doing 25) Today is Thursday and she ____ late twice this week. She ____ late yesterday and on Monday. A. is/was B. has been/is C. has been/was D. has been/had been 26) He ____ in the same house since 1975. A. has lived B. is living C. lived D. had lived 27) We ____ him since he ____ married. A. didn’t see/got B. haven’t seen/got C. don’t/get D. hadn’t seen/got 28) It ____ for two hours and the ground is too wet to play tennis. A. is raining B. had rained C. has rained D. was raining 29) He ____ to HCMC last year and I ____ him since then. A. moved/didn’t see B. moves/haven’t seen C. moved/haven’t seen D. moved/hadn’t seen 30) We ____ what to do with the money yet. A. not decide B. didn’t decide C. haven’t decided D. hadn’t decided 31) My father ____ as a teacher for thirty years. A. works B. is working C. worked D. has worked 32) He ____ to New York three times this year. A. had been B. was C. has been D. is 33) I ____ how to dance when I ____ six years old. A. don’t know / was B. didn’t know / am C. didn’t know / was D. haven’t known/was 34) Last month my brother ____ me his photos. He ____ me his photos every year. A. sends/sent B. sent/sends C. sent/sent D. sends/sends 35) Nam is a careful driver but yesterday he ____ carelessly. A. drove B. had driven C. drives D. was driving 36) Do you like swimming, Ba? – I ____ when I was a child but not now. A. do B. did C. have done D. had done 37) I ____ her at the school gate yesterday. A. met B. meet C. had met D. am meeting 38) She ____ English when she was six years old. A. learned B. has learned C. is learning D. had learned 39) I don’t remember where and when I ____ her. A. meet B. had met C. met D. have met 40) They ____ to know each other for more than ten years. A. get B. got C. have got D. had got 41) ____ you ____ that film yet? A. Do/see B. Have/seen C. Did/see D. Had/seen 42) I ____ the film with my friends last week. A. watched B. watch C. have watched D. had watched 43) He ____ up at five every morning. A. is getting B. got C. gets D. was getting 44) ____ she ____ in Hue at the moment? A. Does/live B. Is/living C. Did/live D. Was/living 45) He usually __ her at weekend but now he __ in bed because of his severe illness. A. visits/stays B. visits/staying C. visited/stays D. visits/is staying 46) Don’t make noise, children! Parents ____. A. sleep B. are sleeping C. were sleeping D. slept 47) Why ____ you always ____ so much noise in the house? I don’t like that. A. do/make B. did/make C. are/making D. were/making 48) What ____ he ____ before you came? A. does/do B. had/do C. had/done D. has/done 49) While mum was watching TV, I ____ my homework. A. am doing B. was doing C. had done D. has done 50) At this time yesterday I ____ to music. A. listened B. had listened C. was listening D. am listening 51) What ____ he ____ at 4 P.m. last Sunday? A. did/do B. was/do C. had/done D. was/ doing 52) When I ____ a little girl, I used to climb trees and go swimming in the river with my friends. A. am B. was C. have been D. had been 53) Last year he came here and ____ me to marry him but I ____ too young to get married. A. asked/ was B. asks/am C. had asked/was D. has asked/am 54) How long ____ you ____ novels? A. have/write B. do/write C. have written D. are/writing 55) ____ you sometimes ____ out with friends? A. Are/going B. Do/ go C. Have/gone D. Did/go 56) I ____ a lot of badminton recently. A. play B. have played C. am playing D. was playing 57) When I ____ home, everyone ____ TV. A. got/watch B. got/watching C. get/was watch D. got/ was watching 58) We ____ your mother for ages. A. don’t see B. haven’t seen C. didn’t see D. hadn’t seen 59) London ____ a lot since we first ____ to live here. A. changed/came B. has changed/ came C. had changed/ came D. has changed/ come 60) How many times ____ you ____ this film? – The first time. A. have/ seen B. did/see C. do/see D. had/seen mình cần gấp nhé
Câu 7: Viết toạ độ địa lý của các điểm A, B biết : - A có vĩ độ là 20 0 Nam, kinh độ là 400 Đông. A - B có kinh độ là 250 Tây, vĩ độ là 100 Bắc
giúp mình vs ạ mình cảm ơi trước
Phản ứng hóa học có sơ đồ sau: C2 H6O + O2 → CO2 + 3H2 O. Tổng hệ số tối giản sau khi cân bằng của các chất là Phản ứng hóa học có sơ đồ sau: CH4 + O2 → CO2 + H2O Tổng hệ số tối giản sau khi cân bằng của các chất là Phản ứng hóa học có sơ đồ sau: C2H5OH + 3O2 → 2CO2 + 3H2O Tổng hệ số tối giản sau khi cân bằng của các chất là
Một hình chữ nhật có diện tích là 1176 cm vuông. Nếu giảm chiều rộng đi 4 cm thì diện tích hình chữ nhật là 1080 cm vuông. Tính chiều dài và chiều rộng của hình chữ nhật đó.
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