Bài 1: Rút gọn các biểu thức sau a, 2(x-1)

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III. Find a mistake in the four underlined parts of each sentence and correct it. 17. My brother has played the piano since he was the small child. A B C D 18. Many extracurricular activities are very useful since they provide kids from many soft skills. A B C D 19. Noise pollution is thought having less damage to humans than water or air pollution. A B C D 20. My friends did the test the most carefully than I did, so they got many good marks. A B C D

Các bạn có cách nào để gửi file 5,600,000 KB ( mk quay màn hình học onl trong vòng 1h để ôn lại, có nhiều vid nhưu thế ) sang kiểu bộ nhớ đám mây. Tại máy tính mk dự trữ nhiều quá hết dung lượng ý, mà gửi zalo nó k cho quá 1024 MB, gmail cx vậy, mà google drive thì tải lên đc nhưng lại không mở ra xem đc. Mình sắp lên 9 nên muốn quay lại vid màn hình để học lại. Mn giúp mk với

II. Choose the best answer by circling the letter A, B, C or D. 5. Helen tries to learn English __________ communicate with the foreigners. A. in order to B. in order that C. so as to D. so that 6. The boy said to his neighbor that he was going on holiday ______. A. the previous day B. the day following C. the day before D. the next day 7. Daisy is addicted _______ social media. She spends lots of time on Facebook and Instagram. A. from B. in C. to D. on 8. The Hung King Temple festival is very crowded. ______, thousands of people want to join it. A. therefore B. as a result C. however D. since 9. He had been working for more than 11 hours. He ______ be exhausted now. A. must B. can C. mustn’t D. can’t 10. At 8 p. m tonight, we___________ a new play. Don’t miss it! A. will be performing B. are going to perform C. had performed D. performed 11. By the time the rescuers________, they_______out of food and water. A. arrived/ had ran B. had arrived/ ran C. arrived/ had run D. had arrive/ run 12. Many fish wouldn’t die if factories________ so many chemicals into riversand oceans. A. wouldn’t dump B. don’t dump C. dumped D. didn’t dump 13. Many books _______ on the shelves when teacher came into the class. A. were arranged B. were being arranged C. was being arranged D. was arranged 14. In a formal interview, it is essential to maintain good eye_______ with the interviewers. A. contact B. link C. touch D. connection 15. Could you tell that person was angry just by looking at his or her face-to-face expression A. meaningful B. sincere C. direct D. attentive 16. “The weather forecast says it’s going to rain tomorrow.” - “_______What a pity.” A. Looks great! B. Not at all. C. Sounds good! D. Oh no!

chứng minh rằng với mọi a,b,c nguyên thì (a-b)^5 + (b-c)^5 +(c-a)^5 chia hết cho 30

I. Choose the word whose underlined part is pronounced differently from the others. 1. A. watched B. dropped C. washed D. travelled 2. A. tables B. couches C. boxes D. houses 3. A. tear B. bear C. hear D. fear 4. A. measure B. leisure C. sure D. pleasure

1. Put the verbs in brackets in the correct tense form . 1. Nam looks brown. He was on holiday last week. He (get). .sunburn 2. Getting plenty of rest is very good. It (help)......... ...you to avoid depression, 3. The Japanese (eat)...........a lot of fish so they are very intelligent. 4. If you wash your hands more, you (have)................. less chance of catching flu. 5. Eating carrots regularly (help).......you see better. 6. It is very hot outside. Please (wear).....................a sun hat when you go out. 7. Do more exercise and you (feel).....healthier. 8. I don't want (be)..... tired tomorrow so I go to bed early . 9. Nowadays, I don't feel well. I often (feel)............................sick and weak. 10. People who (smile).... more are happier and they live longer. II. Put the verbs in brackets in the correct tense form . 1. It is important (eat) well . 2. It (be)_ _very cold today. You should wear your warm clothes when you (go)out to prevent cold 3. Do morning exercise every day and you'll(feel better. 4. I have a lot of homework to do this evening, so I (not have) time to watch the football match . 5. (Eat) dunk food and inactivity (be) the main causes of obesity . 6. I (have)__a headache and I need to rest more . 7. I (have) a toothache so I have to/ seethe dentist. 8. I have to take medicines because I (be) sick. 9. Japanese (eat) more fish instead of meat, so they (stay) more healthy

giúp em bài này với 20) -2x-2y+ax+ay cho em cách giải với đáp án luôn ạ