*SỬA ĐỀ BÀI: `49x^2 - 70x + 25`
`49x^2 - 70x + 25`
`= (7x)^2 - 2.7x.5 + 5^2`
` = (7x-5)^2`
`
`49x^2-70x+25`
`=(7x^2)-2.7x.5+5^2`
`=(7x-5)^2`
Bình phương của một hiệu:`(a-b)^2=a^2-2.a.b+b^2.`
Viết calli tên Hồ Dũng nhé - Đẹp -Vẽ trên phần mềm - Không cần kí trong tranh nhé
I've never seen a better match this one before. ->It is the.....
Xác định các chất A, B, C, D, E, F và viết phương trình thực hiện chuyển hóa sau (ghi rõ đk nếu có) A+O2 -->B--> C--> D--> B--> E--> F--> B
Giải giúp em vs ạ em đang cần gấp
Hãy giúp tôi với tôi cảm ơn rất nhiều giải nhanh giúp tôi
Theo số liệu thống kê, dân số của Hà Nội cuối năm 2018 là 7500000 người. Tỷ lệ tăng dân số của Hà Nội năm 2019 là 1,8%. Tỷ lệ tăng dân số trong năm 2020 được dự đoán là 2%. Tìm dân số của Hà Nội vào cuối năm 2020.
Cho mình hỏi là các bạn có biết trang web nào có vị trí của từ loại đầy đủ nhất không (cho mình link trang web)
Làm hộ em với ạ đề ngữ văn 12 ạ
Gọi a là tập hợp các số tự nhiên lớn hơn 3 và không lớn hơn 10 a) tập hợp a bằng hai cách liệt kê các phần tử và nêu dấu hiệu đặc trưng b) trong các số tự nhiên nhỏ hơn 10 những số nào không phải là phần tử của tập hợp a
31. If I ___ as young as you are, I ___ in a boat round the world. A. were- would sail B. would be – would sail C. were- will sail D. would- would sail 32. If he___tickets yesterday, he ___ on the beach now. A. had booked- would be lying B. had booked- would have lied C. booked – would lie D. books- will lie 33. If you ___ less last night, you ___ so bad today. A. had drunk- would not have felt B. drank- would not feel C. had drunk- would not feel D. would have drunk- would not feel 34. It seemed as if he ___ of it before. A. would never hear B. has never heard C. never heard D. had never heard 35. ___ today, she would get home by Friday. A. Would she leave B. Was she leaving C. Were she to leave D. If she leaves “He ’ s a very brave man.” “Yes, I wish I ___ his courage.” A. have B. had C. will have D. would have 37. ___he___ hard last year, he would have lost the first prize. A. Hadn ’ t – studied B. Had- studied C. Didn ’ t study D. If – had studied 38. We ’ re going to be late if ___. A. we not leave right now B. we didn ’ t leave right now C. we won ’ t leave right now D. we don ’ t leave right now 39. “I wish this city___ so noisy.” “I know. I wish we ___ in the countryside.” A. isn ’ t – live B. wasn ’ t – live C. weren ’ t- live D. weren ’ t – lived 40. He acted as though he___ for days. A. not eat B. hasn ’ t eaten C. hadn ’ t eaten D. didn ’ t eat 41. We ___ the game if we ’ d had a few more minutes. A. might have won B. won C. had won D. will win 42. I ___ William with me if I had known you and he didn ’ t get along with each other. A. hadn ’ t brought B. didn ’ t bring C. wouldn ’ t have brought D. won ’ t bring 43. If you ___ to my advice in the first place, you wouldn ’ t be in this mess right now. A. listen B. will listen C. had listened D. listened 44. ___ interested in that subject, I would try to learn more about it. A. Were I B. Should I C. I was D. If I am 45. I ___ you sooner had someone told me you were in the hospital. A. would have visited B. visited C. had visited D. visit 46. ___ then what I know today, I would have saved myself a lot of time and trouble over the years. A. Had I known B. Did I know C. If I know D. If I would know 47. Do you think there would be less conflict in the world if all people ___ the same language? A. spoke B. speak C. had spoken D. will speak 48. Unless you ___ all of my questions, I can ’ t do anything to help you. A. answered B. answer C. would answer D. are answering 49. Had you told me that this was going to happen, I ___ it. A. would never have believed B. don ’ t believe C. hadn ’ t believed D. can ’ t believe 50. If Jake ___ to go on the trip, would you have gone? A. doesn ’ t agree B. didn ’ t agree C. hadn ’ t agreed D. wouldn ’ t agree ai giúp mình với ạ!!!giải thích hộ mình tại sao lại chọn ý đấy với ạ chứ đừng ghi mỗi kết quả
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