Giải phương trình |2x-1|+|x+3|+|5x+7|=12

Bài1:Tìm 2 số biết trung bình cộng là 75 tổng của chúng là 180. Bài 2: Tìm hai số biết hiệu của chúng là 45 tổng của chúng là 135. Bài 3: Tìm 2 số biết tổng của chúng là 180 số thứ nhất gấp 2 lần số thứ 2. Bài 4: Tìm các chữ số x và y sao cho 34xy chia hết cho 2; 3; và 5 Bài 5: Tìm các chữ số x và y sao cho 4x6y chia hết cho 5 và 9 nhưng không chia hết cho 2.

I. Choose the correct answer: 1. One of the reasons for VNese students’ studying abroad is the quality of the ___________ programmes in higher education. A. vocational B. training C. academic D. worldwide 2. Most of these students are interested in pursuing ___________ studies for bachelor’s degrees. A. post-graduate B. undergraduate C. college D. pre-university 3. The higher education ___________ gained at UK universities and colleges are recognized worldwide. A. degrees B. levels C. skills D. qualifications 4. Universities must better prepare students for their ___________ careers. A. professional B. part time C. full time D. international 5. Some universities in the US offer different ___________ to international students to help to cover tuition fee and living cost. A. qualifications B. scholarships C. skills D. requirement 6. Some students decide to study in the UK to improve their language ___________, which can help them to get a better job. A. careers B. courses C. skills D. standards 7. At most institutions in the UK, the ___________ starts in Sept or Oct and runs until June or July. A. calendar year B. academic year C. leap year D. gap year 8. Academic ___________ are official copies of your academic work. A. accounts B. statements C. transcripts D. records II. Tick the correct answers, and correct the mistakes in the other ones. 1. I have been working for about three hours. 2. I have been having this watch for over five years. 3. The President has been liking for nearly an hour. 4. How long have you been waiting? 5. I have been liking chocolates for years. 6.Have you been knowing Maria for a long time? 7.She’s been reading that book for weeks. 8. I haven’t been seeing David for years. 9.I’ve been hating onions since I was a child. III. Give the correct tense of verb (present perfect/present perfect continuous) 10. Mai has been staying with her grandmother for the last two weeks. 1. I think ________________ (meet) the man who is my Math lecturer. 2. I ________________ (read) this novel and I really want to know what happens in the end. 3. Ann ________________ (look) for a university in England for a week, and she still ________________(not find) one. 4. They ________________(build) their house for ages and hope to finish next year. 5. I ________________(get) new qualifications all my life. 6. My brother ________________ (start) a new job with a good salary. 7. Have you ________________(fill in) the application form yet? 8. She’s always ___________(love) animals.

7+ (-10) :2 2-(-1)-8 5+(-3). 4-4 6-7.2-2.(-3) 8mũ2 - 9 mũ2 +(1-3). (2-5) (4-3.2) (1-7mũ0)

Bài 3: tìm số nguyên x biết: a,10+x =-24 b,80-(10x-5)=2².5 c,|5+5x|=2².5

Write an essay: air conditioner is more useful than fans. Do you agree or disagree?

IV. There is one mistake in each of the following sentences. Find and correct it. 31. Her grandmother is complaining so she's always dumping her school things in the floor. 32. Water from power stations may cause water in rivers and lakes hotter. 33. We've decided to cancel our picnic because of it's forecast to rain tomorrow. 34. Radiation may result to childhood cancer. 35. He worked in a noisy environment for a long time, because his hearing became worse. 36. Researchers haven't found out what has led in the pollution of the river.

III. Match a sentence in Column A with an appropriate sentence in Column B. Column A Column B 1. I was very fit when I was young . A. He used to smoke a lot. 2. The teachers at my school were kind. B. He used to play for the local team. 3. My brother’s room was so messy . C. It used to follow me everywhere. 4. I had a dog when I was a kid . D. We used to go everywhere by bus. 5. My family had some lovely holidays. E. We used to freeze on winter mornings. 6. When I was young, we didn’t have a car. F. He used to fly Airbus. 7. And we didn’t have central heating. G. He never used to tidy it at all. 8. My uncle was a pilot for Vietnam Airlines. H. I used to do a lot of exercises. 9. My father was weak. I. They used to help pupils. 10. My brother was a soccer player. J. We used to go camping all over the country.

tìm x biết (x-29)-(17-38)=-9 giúp mình với

Cho tam giác ABC có AB=AC gọi M là trung điểm của BC chứng minh rằng AMB=AMC AM là tia phân giác AM vuông góc với BC Vẽ At là tia phân giác góc ngoài ở đỉnh a chứng minh rằng At song song với BC