Rút gọn các biểu thức sau: A=100²-99²+98²-97²+........+2²-1² Giúp mình với

Ở một loài thực vật,hoa đỏ là tính trạng trội so với hoa trắng . Hãy nêu phương pháp xác định kiểu gen của cây hoa đỏ này

ài 7. Một mảnh vườn hình chữ nhật có chiều rộng 20 mét, biết 2 lần chiều dài bằng 4 lần chiều rộng. Xung quanh mảnh vườn đó người ta trồng cam, cứ cách 4m trồng một cây. Hỏi xung quanh mảnh vườn đó người ta trồng được bao nhiêu cây cam?

6. Table/be/next/cupboard/./on/table/be/vase/flowers and/ two/ teacup. 7. What/you/do/present?- I/play/chess/living room. 8. On/desk/there/be/laptop. 9. My boss/often/get/office/a taxi. 10. You/can/see/your name/bottom/page. 11. Hon Trong Mai/be/island/east/Quang Ninh.

mình đg ktra 15' nên các bạn làm nhanh nha

vì sao cùng năm trê n 1 vĩ độ giống nhau mà khí hậu ả rập khô và nóng hơn việt nam

B = $\frac{1}{1.1985}$ + $\frac{1}{2 . 1986}$ + $\frac{1}{1 . 1987}$ + ... + $\frac{1}{16 . 2000}$

1. Bedroom/next/kitchen/first floor? 2. There/be/grocery store/end/street? 3. Musk/ sometimes/have/breakfast/nearby “Pho Bo” restaurant. 4. Mina/sit/beside/Hung/classroom. 5. My school/be/north/Pho Chau town. 6. Table/be/next/cupboard/./on/table/be/vase/flowers and/ two/ teacup. 7. What/you/do/present?- I/play/chess/living room. 8. On/desk/there/be/laptop. 9. My boss/often/get/office/a taxi. 10. You/can/see/your name/bottom/page. 11. Hon Trong Mai/be/island/east/Quang Ninh.

Put the verbs in brackets in the past simple or the past continuous tense

giúp mk với ah 21. “Where should I wait for the bus?'' - “________”' A. I think it takes about half an hour. B. I'm sorry I don't know how to get there C. There's nothing to discuss. D. There's a bus stop over there. 22. “Do you know where Paul is?” “...........................” A. Pardon, I don’t know. B. I’m afraid I don’t. C. Why not? D. It’s no use. 23. “You won the first prize, Jane.” “...........................” A. You are very welcome. B. Congratulations! C. You are kidding. D. Well done. 24. “It is very kind of you to invite us to your party.” “...........................” A. No, thanks. B. Good idea, thanks. C. OK. That’s great. D. It’s my pleasure. 25. What do you think of these stories? - ______________ . A. They are OK B. Yes I do C. I don’t think D. I think of them 26. A: “Is it going to rain tonight?” – B:” _____________ .” A. I don’t hope so B. I hope not C. I think not D. Yes, I am 27. Sue: “I love pop music.” – Alice: “____________.” A. I do, too B. No, I won’t C. Yes, I like it D. Neither do I 28. David: “Happy Christmas!”- Jason: “____________” A. You are the same! B. Same for you! C. The same to you! D. Happy Christmas with you! 29. A: “Sorry I’m late.” – B: “____________.” A. OK B. Don’t worry C. Hold the line, please D. Go ahead 30. A: “Excuse me, what’s the time?” – B: “Sorry. I ___________.” A. don’t see B. do not have a watch C. won’t know D. know 31. A: “I hope to see you again.” – B: “____________” A. I hope so, too B. Good enough C. Thank you D. I really enjoy meeting you, too. 32. A: Does Maria speak English well? – B: …………………………. A. Yes. I do B. I think not C. I don’t think so D. She thinks so 23. How………………was your holiday? – One week. A. long B. big C. soon D. well 33. “Have you ever met the girl over there?” – “No. ……………………?” A. I don’t B. I have C. Why not D. Who is she 34. Brenda: “Do you think it will rain?” – Carol: “Oh! ……………………………” A. I don’t hope B. I hope not C. I don’t hope so D. It’s hopeless