so sánh A và B biết rằng A=2010/2011+2011/2012+2012/2010 và B=1/3+1/4+1/5+...+1/17

Ex 3: PASSIVE VOICE: CHUYỂN CÂU CHỦ ĐỘNG SANG BỊ ĐỘNG 1. My father waters this flower every morning. 2. John invited Fiona to his birthday party last night. 3. Her mother is preparing the dinner in the kitchen. 4. We should clean our teeth twice a day. 5. Our teachers have explained the English grammar. 6. Some drunk drivers caused the accident in this city. 7. Tom will visit his parents next month. 8. The manager didn’t phone the secretary this morning. 9. Did Mary buy this beautiful dress? 10. I won’t hang these old pictures in the living room. 11. The German didn’t build this factory during the Second World War. 12. The Greens are going to paint this house and these cars for Christmas Day. 13. Ann had fed the cats before she went to the cinema. 14. The students have discussed the pollution problems since last week. 15. Have the thieves stolen the most valuable painting in the national museum? 16. Some people will interview the new president on TV. 17. How many languages do they speak in Canada? 18. Are you going to repair those shoes? 19. He has broken his nose in a football match. 20. Have you finished the above sentences?

1)I (be)...was...a student 2 years ago 2)he(be)...a doctor two years ago 3)they(be)...farmers last year 4)Lan and Ba (be)...nurses last year 5)It (be)...cold last night 6)the windows (be)...open last monday 7)(Be)...you a teacher two years ago? yes,I (be)... 8)this hat (be)...new last week 9)where (be)...Nam from yesterday 10)my parents(be)...teaches years ago

Bài 1: Một người đi xe máy từ Minh Cầm tới Ba Đồn dài 30km mất 0,5 giờ đi từ Ba Đồn tới Đồng Hới dài 40km mất 0,75 giờ . Tính vận tốc trung bình của người đi xe máy trên cả đoạn đường từ Minh Cầm – Đồng Hới Bài 2: Một xe máy đi từ Đồng Lê đến Đồng Hới với vận tốc trung bình 50 km/h . Biết nữa quãng đường đầu đi với vận tốc 65km/h . Tính vận tốc của xe ở nữa quãng đường còn lại Help :<<

Trong lịch sử xã hội loài người, nhà nước xuất hiện từ khi nào? Tại sao khi đó nhà nước xuất hiện?(2 điểm)

1.Last night, while I (do) my homework, my mother (make) some cakes. 2. (Be) quiet, everyone. Someone (come). 3. John (call) when I (water) the flowers in the garden. 4. This is the first time I (eat) a meal (cook) by a Japanese cook. 5. Why (you/ always/ talk)? You’d better (concentrate) on your work. 6. He usually (come) home before 10, but last night he (stay) out very late. 7. If I (be) you, I (not apply) for this job. 8. The film we saw last night (not be) as interesting as we (expect). 9. (Not know) the way, he stopped (ask) a passer-by. 10. He should know how (use) the lift, but if he doesnot you'd better (show) him.

Phân tích tâm trạng của Thúy Kiều sau khi trao duyên

10,08ha=..ha..m vuông 105 cm vuông=..dm2...cm2 50800m2=...ha...m2 266 ha 6 dam2=...km 300,7 dm2=...m2...cm2 3208ha=..km2..ha 12 phút=...giờ 1 giờ 24 phút=...giờ 2,6 phút=..giây 2/3giờ=...phút 1/2 giờ =..phút 90 phút=..giờ 1,5 giờ =...phút 2 tiếng rưỡi =....giờ 105 phút=...giờ viết luôn kết quả nhé làm nhanh giùm mk nhé

5. Gathering and hunting still ___________ an important role in the economy of the Laha. A. have B. keep C. play D. get 6. Ethnic peoples in mountainous areas usually have a ___________ way of farming. A. developed B. modern C. complicated D. poor 7. ____________ is more colorful, the Nung’s or the Hoa’s costume? A. What B. Which C. Why D. Who 8. It is the custom for my family ____________ goodbye before going to work. A. said B. say C. to say D. saying 9. They broke ___________ tradition by making those cakes for the festival. A. with B. in C. to D. on 10. You ____________ take off your hat when going inside the worship area of the temple. A. don’t have to B. have to C. can’t D. can

b=1-2-3+4+5+6-7+8+...+1993-1994