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2 năm trước
1 tính: a) (-1/3) mũ -1 - (-6/7) mũ 0 + (-1/2) mũ 2 : 2 b) (1000 - 1 mũ 3 ) x ( 100 - 2 mũ 3) x ( 1000 - 3 mũ 3) x...x ( 1000 - 50 mũ 3) c) D= 2021 mũ ( 1000 - 1 mũ 3) x (1000 - 2 mũ 3) x...x( 1000 - 15 mũ 3)
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Các câu hỏi liên quan

Keeping our teeth healthy Many people nowadays ________(1) wear false teeth when they are middle-aged. Doctors and dentists now __________(2) that sugar is the chief cause of ___________(3) decay. Long ago doctors __________(4) not like to treat people's teeth. Babers and blacksmiths looks _________(5) people'steeth and pulled them ________(6) when they decayed. Some people thought toothache was a punishment from the gods. It is very important to have ________(7) teeth. Good teeth help us to chew our food. They also help us to look nice. How can we keep our teeth healthy? – First, visit our dentist at least twice a year. He can examine our teeth to check that they are good or _________(8) or are growing in the right way. Secondly, brush our teeth with fluoride toothpaste ____________(9) meals and before bedtime. We can also use wooden toothpicks to clean between our teeth after a meal. Thirdly, we should eat food that is good _________(10) our teeth and body: milk, cheese, fish, brown bread, potatoes red rice, raw vegetables and fresh fruit. 1. A. has to B. have to C. having to D. had to 2. A. knows B. knowing C. know D. knew 3. A. tooth B. teeth C. gum D. mouth 4. A. do B. are C. were D. did 5. A. for B. after C. at D. into 6. A. out B. of C. off D. in 7. A. beautiful B. useful C. helpful D. healthy 8. A. nice B. pretty C. bad D. badly 9. A. before B. after C. when D. while 10. A. for B. with C. to D. of

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions. 11. My house is not far from my school, so I usually go ________. A. on foot B. by foot C. by car D. by boat 12. ________ cars emit low emissions and make the environment safer. A. High speed B. Eco-friendly C. Automated D. Supersonic 13. At 3 o’clock tomorrow afternoon, he ________ the Meeting on Climate change. A. attended B. will attend C. will be attending D. will be attended 14. My borther used to ________ a lot when he was young. A. swim B. swimming C. swam D. swims 15. I got really ________ when I saw the main character being killed. A. frightening B. frightened C. boring D. amusing 16. My friend didn’t have his mobile, so I lent him ________. A. his B. their C. mine D. her 17. ________ we lost the game, we were happy that we played well. A. If B. Nevertheless C. Because D. Although 18. It’s really difficult to ________ a bicycle up the hill. A. fly B. drive C. pedal D. sail 19. Natural gas is limited and it is harmful ________ the environment. A. to B. in C. with D. for 20. The film was so ________ that the two girls next to me couldn’t stop crying. A. moving B. thrilling C. exciting D. fascinating Mark the letter A, B, C, or D on your answer sheet to indicate the most suitable response to complete each of the following exchanges. 21. – Shall we go to the cinema tonight? - _________________. A. That’s a good idea B. Yes, we shall C. That a question D. You are welcome 22. - What a beautiful monowheel! - ____________________. A. I’m glad to tell you so B. I bought it in America C. You’re welcome D. I don’t mind if you say so

1. A. skims B. works C. sits D. laughs 2. A. fixes B. pushes C. misses D. goes 3. A. cries B. buzzes C. studies D. supplies 4. A. holds B. notes C. replies D. sings 5. A. keeps B. gives C. cleans D. prepares 6. A. runs B. fills C. draws D. catches 7. A. drops B. kicks C. sees D. hopes 8. A. types B. knocks C. changes D. wants 9. A. drinks B. rides C. travels D. leaves 10. A. calls B. glasses C. smiles D. learns 11. A. schools B. yards C. labs D. seats 12. A. knives B. trees C. classes D. agrees 13. A. buses B. horses C. causes D. ties 14. A. garages B. boats C. bikes D. roofs 15. A. ships B. roads C. streets D. speaks 16. A. beliefs B. cups C. plates D. apples 17. A. books B. days C. songs D. erasers 18. A. houses B. knives C. clauses D. changes 19. A. roofs B. banks C. hills D. bats 20. A. hats B. tables C. tests D. desks 21. A. gives B. passes C. dances D. finishes 22. A. sees B. sings C. meets D. needs 23. A. seeks B. plays C. gets D. looks 24. A. tries B. receives C. teaches D. studies 25. A. says B. pays C. stays D. boys 26. A. eyes B. apples C. tables D. faces 27. A. posts B. types C. wives D. keeps 28. A. beds B. pens C. notebooks D. rulers 29. A. stools B. cards C. cabs D. forks 30. A. buses B. crashes C. bridges D. plates

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