không quy đồng tử số và mẫu số . hãy so sánh : a) 13/17 và 15/19 b ) 12/49 và 9/36 giải thích nx nha

Xác định thành phần biệt lập có trong đoạn trích Kim Woo Chung, người sáng lập tập đoàn Daewoo từng viết trong quyển sách "Thế giới quả là rộng lớn và có rất nhiều việc phải làm" rằng: "Lịch sử thuộc về những người biết ước mơ. Tôi cam đoan rằng tất cả những người đang làm nên lịch sử thế giới ngày hôm nay đều có những ước mơ lớn khi còn trẻ". Dù thay đổi bản thân mình hay thay đổi thế giới, thì người ta cũng bắt đầu bằng ước mơ. (Rosie Nguyễn, Tuổi trẻ đang gia bao nh

Cho dãy tỉ số bằng nhau $\frac{2bz-3cy}{a}$ = $\frac{3cx-az}{2b}$ = $\frac{ay-2bx}{3c}$ . CMR: $\frac{x}{a}$ = $\frac{y}{2b}$ = $\frac{z}{3c}$

Cho n là số tự nhiên có 2 chữ số. Tìm n biết n + 4 và 2n đều là các số chính phương

Tìm các số nguyên dương x,y,z biết $\frac{x}{7}$+$\frac{y}{11}$+$\frac{z}{13}$ = 0,(946053)

các anh chị cho em hỏi abc bài hình ạ các anh chị vẽ luôn hộ em ạ Em cảm ơn nhiều

Some people think that country people are ……………………than city people. ( friendly) * Which one is ……………………..……………………………, Red River or Mekong River? (long) * Which is ……………………..……………………………, river in the world? (long)

giải rõ ra cho mình nha đừng làm tắt đó

1. The bell (ring) __________________ if there (be) _________________ a fire 2. If you (not learn) __________________ all three of you (get) _________________ on it! 3. If we (reuse) _________________ things, this (minimize) __________ the dependence of making new things 4. We (reduce) ___________ noise pollution if we (grow) ______________ more trees since they absorb sound 5. If we (recycle) _________________ glass, we (reduce) _________________ air pollution by 20 percent (%) 6. If you (hear) ________________ loud noise too often, you (have) _________________ hearing loss 7. The bike (break) _________________ if all three of you (get) _________________ on it! 8. We (also cut) __________________ down the amount of pollution we create ifwe (cut) ________________ down the use of fossil fuels 9. You (save) __________________ 40 watt-hours a day if you (turn) _______________________ off your computer before bedtime 10. If I (have) _______________________ no money left I (not buy) ______________________ that expensive book Choose the best answer 1. What will happen if you _____ to work tomorrow? A. didn’t go B. don’t go C. won’t go D. wouldn’t go 2. We’ll get wet if we _____ out A. go B. did go C. went D. had gone 3. If I go shopping, I ____ some food A. buy B. will buy C. would buy D. would have bought 4. If I find it, I ____ you A. will tell B. would tell C. had told D. told 5. If she sells her car, she ____ much money A. gets B. would get C. will get D. would have got 6. If I ______ to Athens, I’d visit the Acropolis. A. goes B. went C. will go D. would go 7. If I had money, I _____ some to the poor. A. give B. would give C. gave D. will give 8. If she _____ rich, she would buy a yacht A. were B. weren’t C. wasn’t D. didn’t be 9. If Simon had a garden, he ______ trees A. planted B. would plant C. will plant D. wouldn’t plant 10. If Mary ____ time, she’d go out more A. have B. has C. had D. didn’t have Complete the sentences with the correct verbs form in the bracket 1. If we meet at 9.30, we (have) ____________ plenty of time 2. Unlesshe (tell) ________________ the truth, I won’t helphim. 3. You’ll get pneumonia if you (not charge) _________________ your wet clothes 4. If you go to Paris, whereyou (stay) _____________________? 5. The doors will be unlocked if you (press) _________________ the green button 6. If I _______ (have) more free time, I would take up a hobby 7. If I were you, I __________ (study) harder. 8. If he ___________ (not/be) afraid, he would go bungee jumping 9. If I saw a ghost, I _________________ (scream). 10. If I had a good voice, I ____________ (become) a singer. Write a sentence with “if” for each situation 1. You drive fast. You have an accident You 2. Tim drinks too much alcohol every day, that’s why he is hospitalized for treatment. If 3. They don’t open the door. The room is very dark If 4. We pollute the river. We don’t have water to use If 5. She doesn’t hurry. She is late for school  If 6. Study hard, or you won’t pass the exam If 7. Don’t be impatient, or you will make mistakes If 8. We save water. We won’t have to suffer from water shortage  We 9. I like these shoes but they’re too expensive, so I’m going to buy them If 10. She cannot cook because she feels very tired today.  She 11. My health improves better because I exercise daily. If 12. Follow the instructions, or you will ruin everything. If 13. Stay away from this place, otherwise I’ll report the area’s security. If 14. She cannot cook because she feels very tired today. If 15. They don’t understand the problem. They won’t find a solution → If they 16. I don’t have a spare ticket. I can’t take you to the concert → If I

dịch đoạn văn sau: ( thanks rất nhiều:))