Bài 2. Viết số thích hợp vào chỗ chấm :
a) Một hình tròn có chu vi 16,328cm. Đường kính của hình tròn đó là ……………5,2……… cm.
b) Một hình tròn có chu vi 254,24dm. Bán kính của hình tròn đó là ………6356/157…………… dm.
Đáp án:
Giải thích các bước giải:
Bài 2:
a, Một hình tròn có chu vi 16,328cm. Đường kính của hình tròn đó là 16,328:3,14=5,2 cm.
b, Một hình tròn có chu vi 254,24dm. Bán kính của hình tròn đó là 254,24:3,14:2=6356/157dm.
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mọi người giúp em giải bài này với ạ ToT
EXERCISE 2: Add tag questions to the following 1. Your name is Thanh , ……………………………….. ? 2. Today is Sunday , ……………………………….. ? 3. John doesn’t agree with me about the plan , ……………………………….. ? 4. There’s a bus coming , ……………………………….. ? 5. Everybody was saying their prayers in the church when I cane in, ……………………………….. ? 6. He makes a lot of mistakes in pronunciation , ……………………………….. ? 7. The traffic was heavy yesterday , ……………………………….. ? 8. Both men won’t surf the Internet for a chat any more , ……………………………….. ? 9. A lot of students don’t think studying grammar is interesting , ……………………………….. ? 10. We haven’t done this homework yet , ……………………………….. ? 11. Jack’s enrolled on this course , ……………………………….. ? 12. Helen’s got fashionable clothes to wear on this important occasion , ……………………………? 13. The Smiths have got a computer , a CD player and two motorbikes , …………………………… ? 14. The children have many computer games to play , ……………………………….. ? 15. Your brother has the chance to speak English outside the classroom , ………………………… ? 16. David and Kate aren’t going to pay their school fees tomorrow , ……………………………….. ? 17. There weren’t any well- qualified teachers at this school , ……………………………….. ? 18. This boy could use a computer at the age of 5 , ……………………………….. ? 19. MY father put an advertisement in the Times to sell his house , ……………………………….. ? 20. It is expensive for you to access the Internet , ……………………………….. ? 21. Jim really shouldn’t spend most of his time wandering on the Internet , ………………………… ? 22. People don’t know which website is useful to them , ……………………………….. ? 23. Students have to wear uniforms in Vietnam , ……………………………….. ? 24. Email is good way for people to communicate , ……………………………….. ? 25. The garbage can be taken out everyday , ……………………………….. ? 26. We must send this message by email , ……………………………….. ? 27. You wouldn’t like another drink , ……………………………….. ? 28. Vinh would rather listen to English programs on the radio , ……………………………….. ? 29. You had better not go out in the cold weather , ……………………………….. ? 30. Ba ought to join her family on a day trip to her hometown , ……………………………….. ? 31. My sister might like writing email , ……………………………….. ? 32. You should attend the opening ceremony , ……………………………….. ? 33. You wouldn’t mind helping me with this , ……………………………….. ? 34. I needn’t say anything to you about it , ……………………………….. ? 35. Your aunt needs to grow rice on his farm , ……………………………….. ? 36. This is Mr. Johnson , ……………………………….. ? 37. That was Ann on the phone , ……………………………….. ? 38. Those weren’t your parents over there , ……………………………….. ? 39. These are your cases here , ……………………………….. ? 40. The Chinese invented paper in AD 105 , ……………………………….. ?
Vẽ gacha hoặc là chibi đi mọi ngừi ơii:3 Không cop mạng>:v
Ex3.Complete the sentences by repeated comparatives (... and...). 1.When I get excited, my heart beats…………. . (fast) 2.Cathy got ……….in her job. In the end she left.(bored) 3.Since An went to Canada, her English has got…. (good) 4.My bags seemed to get……as I carried them. (heavy) 5.The weather is getting……with each passing day. (warm) 6.Health care is becoming ……nowadays. (expensive) 7.As I waited for my interview, I became ……. (nervous) 8.As the day went on, the weather got ………….. . (bad) 9.When you blow up a balloon, it gets …….. . (big) 10.These days….. people are learning English. (many) Ex4. Combine each pair of sentences with double comparatives (the more/–er ... the more/ -er). 1. The fruit is fresh. It tastes good. 2. We got close to the fire. We felt warm. 3. A knife is sharp. It is easy to cut something. 4. The test is difficult. We try hard. 5. The hotel is expensive. The service is good. 6. The party got noisy. I got angry. 7. She drove fast. I became nervous. 8. The sky grew dark.We ran fast to reach the house. 9. You use a lot of electricity. Your bill will be high. 10. I thought about the plan much. I liked it little. giúp mk vs cảm ơn nhiều
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Tìm x ∈ Z biết: a) (|x| + 3). 15 + 10 = 70 b) 86: [2. (2x - 1)2 – 7] + 42 = 2.32
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