cho dãy tỉ số 14bz-15cy/a=9cx-7az/2b=5ay-6bx/z chứng minh 3x/a=5y/2b=7z/3c
Rút gọn biểu thức vô tỉ làm từ g trở đi
nếu giữ nguyên khoảng cách từ điện tích nguồn tới điểm đang xét và tăng độ lớn điện tích lên 5 lần thì cường độ điện trường:
5. X là dung dịch HCl nồng độ x mol/l. Y là dung dịch Na2CO3 nồng độ y mol/l. Nhỏ từ từ 100 ml X vào 100 ml Y, sau các phản ứng thu được V1 lít CO2 (đktc). Nhỏ từ từ 100 ml Y vào 100 ml X, sau phản ứng thu được V2 lít CO2(đktc). Biết tỉ lệ V1: V2= 4 : 7. Tỉ lệ x : y bằng: Gấp chỉ când đáp
Mn giải hộ em 3 bài này đi ạ cần gấp
tìm x biết : a) 2x^2+16x+32=0 b) (3x-5)^2-25x^2=0
26. If we continued to cut down the trees, there will be big floods every year. A. continue B. down C. there D. every year 27. It is impossibly that we can use up the natural resources and protect the environment at the same time. A. impossibly B. use C. the D. at 28. I am extremely unhappy that you have been late five times this months. A. extremely B. that C. have been D. months 29. Traffic jams are better avoided since more people in the city are using buses instead of ride motorbikes. A. are better B. since C. are using D. ride 30. If we pollute the water, we will have no fresh water using. A. If B. the C. have D. using mn sửa lỗi với lí do hộ e ạ e cám ơn
AE GIỎI TOÁN ƠI, GIÚP MÌNH HAI BÀI NÀY VỚI :((((((((((
1. After he (spend) _____________his holiday in London, he (want) ____________ to learn English. 2. When she arrived, the match (already begin) _________________. 3. By the age of 34, my brother (start) _______________ his own business. 4. Before Peter (move) ____________ to London last week, he (live) ______________ in Paris for more than ten years. 5. Tom and I (be) ________________close friends since we were at Class 6. 6. Don’t make noise! My mother (talk) _______________ with her friends. 7. Shakespeare (write) ________________ Hamlet at the end of the sixteenth century. 8. I’m not in a hurry. I don’t mind (wait) ________________. 9. Like other workers, Yamanda (begin) ______________his work at 7:00 every day. 10. Marie Curie (earn) ____________ a physics degree before she took another degree in mathematics. II. Fill in each blank with given word in the box: tragic living conditions awarded mature harboured ease interrupted 1. She _____________ the thought of being a member in the Parliament. 2. In our modern time, human life has become better and better. The ____________ are high. 3. His mother's death is the greatest ______________ event that she never gets rid of. 4. After every semester some best students are always _____________ prizes and scholarships. 5. Take some aspirins. They can ____________ your headache. 6. Sue is ____________for her age. She behaves like an adult 7. When we were on the phone, the crossed line was ____________ because of a wrong connection. III. Supply the correct prepositions: 1. Because of financial problems, she could not go __________ her study at university. 2. He passed the final exam ___________ flying colors, which made his parents pleased and proud. 3. Mr. and Mrs. Pike retired last year. Now they live __________ their retirement pension. 4. Marie Curie was the first woman professor _________ Sorbonne. 5. Having received a large sum of money, she decided to continue her research _________ the project. 6. When her husband died, she took __________ his position in the company. IV. Supply the correct word form 1. There is no _____________ explanation for what happened. (SCIENCE) 2. We often receive general _____________ at school. (EDUCATE) 3. Everybody shows their deepest sympathy on the ___________ of the flood victims. (DIE) V. Find a mistake in the four underlined parts of each sentence and correct it: 1. She (A) has lived in London (B) for five years (C) before she (D) moved to New York. ....................................................................................................................... 2. She (A) advised (B) me (C) study (D) hard to pass the examination. ....................................................................................................................... VI. Choose the word which has the underlined part pronounced differently from the rest: 1. a. death b. sea c. receive d. teacher 2. a. brilliant b tragic c. award d. mature VII. Choose the word which is stressed differently from the rest: 1. a. background b. chemistry c. harbor d. scientific 2. a. award b. begin c. marry d. determine Giúp e vs ạ
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