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letodo1209
2 năm trước
Một hộp đựng 15 quả bóng bàn trong đó có 7 quả màu trắng và 8 quả màu hồng rút ngẫu nhiên cùng lúc 3 quả. Tìm xác suất A: có đúng 1 quả màu hồng B: cả 3 quả cùng màu C: có ít nhất 2 quả màu hồng
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Các câu hỏi liên quan

I. Rearrange the words to make sentences. 1. is / sister / staying / my / at / hostel / the//. 2. school / smaller / her / her / school / new / than / is / old//. 3. the / far / it / from / how / your / is / to / post / house / office/ ?// 4. brother / your / different / is / from / how / you / ?// II. Find the word which has different sound in the underlined part in each line. 1. A. birthday B. thirteenth C. thing D. that 2. A. calendar B. parents C. pretty D. learn 3. A. finish B. invite C. sometime D. nice III. Fill one word in the blank. Dear Huong, Next Sunday ____________ be my 13th birthday. I will ___________ a party at my house __________ 7 p.m. I will invite __________ close friends of ours. I think _________ will have a _________ time that day. I __________ you will come __________ join me. Love, An IV. Fill one preposition. 1. We’re talking ___________ Lan’s family. 2. I found a place __________ us to live in Hue. 3. A farmer works hard __________ morning _________ night. 4. My mother is a teacher. She works ___________ a primary school. 5. Mr. Tuan is a journalist. He wirtes ___________ “Nhan Dan”. 6. There’s a good house ___________ 27 Hai Ba Trung Street. VI. Give the correct form of the verbs. There are four people in Minh’s family: his father, mother, his older sister and him. His father (be)_________ a worker. He (work)_________ in a factory. His factory (produce)__________ bicycles. His mother (be)_________ a nurse. She (take)__________ care of sick people in the hospital. His sister (study)__________ at university and she (be)___________ a teacher next year. Minh (be)___________ a pupil. He (study)___________ very well. All the members of the family (feel)___________ happy together. They (go)___________ to Nha Trang for their holidays this summer. VIII. Give the correct form of comparison . 1. London is much (old)________________ than New York. 2. Of the three cities, Ho Chi Minh City is (big)________________ one. 3. Everything in this city is (expensive) __________________ than I thought. 4. I feel a little (good)________________ than yesterday. 5. Our parents want to find a (beautiful) __________________ house than the old one. 6. In our class Viet is (good)________________ student of all. 7. The streets in Hue are (narrow)________________ than those in Hanoi, but they are much (clean)______________. 8. Which pen of these do you prefer? – The (small) ________________ one. IX. Use the words to make comparative sentences 1. This room / nice / the hotel. 2. Films / interesting / plays. 3. Jack / intelligent pupil / the class. 4. Russia / large country / world. 5. Everest / high mountain / world. 6. He / good player/ team. 7. good health / important thing / life.

2. Chia động từ trong ngoặc ở thì tương lai tiếp diễn 1. I (learn)………………….English at this time tomorrow. 2. My mother (go)……………………to France at this time next month. 3. They (sell)………………..winter closes at this time next week. 4. Jim (read) …………………in the library at 3 p.m tomorrow. 5. He (not study)…………………at that time tomorrow. 6. …………………….(you/ stay) at home when I arrive tomorrow? 7. My father (watch)…………..a soccer match on TV at 8 o’clock tomorrow evening. 8. Our teacher (teach) …………….Math at this time next week. 9. Jim and Jane (go)…………to the local museum at this time next week. 10. All the students (sit)……..the English Exam at 7.a.m. tomorrow. 11. What……(Peter/ do) at & o’clock tomorrow morning? 12. Peter (write)…………..a report. 13. I’m very busy tomorrow morning. I (not/play) ……………sport at 8 a.m. 14. ……………………….(the baby/ sleep) at 9p.m. tomorrow? 15. A well – known professor (deliver) …….a lecture at my university at 8 a.m.

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