-35 thuộc Q thì -35=-35/1 là số hữu tỉ

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Có vì -35 có thể viết dưới dạng phân số.

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Sunshine
12 phút trước

`-35 in QQ` vì `-35 = -35/1 (-35, 1 in ZZ, 1 ne 0)`.

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lanh
11 phút trước

giúp t đi

 

 

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a: \(n_X=\dfrac{8.96}{22.4}=0.4\left(mol\right)\)

=>\(n_{N_2}=0.1mol;n_{O_2}=0.1mol;n_{CO_2}=0.2\left(mol\right)\)

\(m=0.1\cdot28+0.1\cdot32+0.2\cdot\left(12+32\right)=14.8\left(g\right)\)

b: \(M_X=\dfrac{14.8}{0.4}=37\)

\(d_{\dfrac{X}{H_2}}=\dfrac{37}{2}\)

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Sunshine
19 phút trước

Vì `M` vuông góc, `A, B`.

`-> A //// B`.

`hat(K_1) = 180^o - 125^o = 55^o`

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Ta có: M ⊥ AB (gt)

           N ⊥ AB (gt)

=> M // N ( từ ⊥ → // )

Ta có : M // N ( cmt )

\(\Rightarrow\) \(\widehat{K_1}+\widehat{AIK}=180^o\left(TCP\right)\)

Mà \(\widehat{AIK}=125^o\left(gt\right)\)

\(\Rightarrow\widehat{K_1}=180^o-125^o=55^o\)

\(\Rightarrow\widehat{K_1}=55^o\)

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Hằng Nguyễn

5 TRỌNG TÂM ÔN TẬPMÔN TIẾNG ANH 1I. Choose the best option.1. ..................... do you use the Internet?’ -‘Twice a week’A. How many B. How oftenC. How D. when2. Bad driving often ............... many accidents. A. causedB. causedC. causesD. has caused3. Minh is very good at music. He has a fine........for music.A. earB. tooth C. hand D. foot4. The swimming pool..................at 9 o’clock and ............at 18.30 every day.A. opens/closesB. opens/closedC. opened/closedD. opened/closes5. My sister was born..............July 9th.A. onB. inC. byD. at6. I ........... learning English three years ago.A. start B. startedC.have started D. was starting7. Do you like..........?A. go shoppingB. going shoppingC. to go shoppingD. went shopping8. Howis it from here toHanoi? A. longB.oldC. manyD.far9. My grandfather.............many years ago.A. dies B. has died C. diedD. was dying 10. Can you ____________a photo of us?A. getB. takeC. makeD. do11. Her mother bought her ...........uniform yesterday.A. aB. anC. theD. ø12. ..................... long or short?A. Does Mai have hairB. Is Mai’s hairC. Does Mai’s hair have D. Is hair of Mai13. It ......................... heavily at the moment.A. rainsB. was rainedC. is rainingD. rained14. The children usually .................. their friends after school.A. meetsB. didn’t meetC. are meetingD. meet15. Where ............Mrs Mai live when she was 26 years old?A. didB. doC. doesD. is16. I don’t understand this sentence. What ............................?A. doesmean this wordB. have this word meanC. means this wordD. does this word mean17. The opposite of “safe”is _____________.A. dangerousB. difficultC. differentD. easy18. I am ..........., so I don't want to eat any more.A. hungryB. thirstyC. fullD. small19. He sometimes travels..........car..........hisfather.A. by/ forB. by/ withC. with/ byD. for/ by 20. That boy is very ................A. intelligence B. intelligently C. intelligentD. B & C21. On Christmas Eve, people usually...................... a treeA. are decorated B. were decorated C. decorating D. decorate22. What's was wrong with your printer?A. It didn't workB. It's doesn't C. Ithasn't work D. It won't work.23.We start school .............. 9 o’clock.A. inB. ofC. onD.at24. It is difficult ......all the instructions at the same timeA.to rememberB. rememberC. rememberingD. remembered25. She is ................newspaper inthe living room now.A. reads B. readingC. read D. to read26..Thomas .................. well. He’s got a great voice.A. singB. is singingC. singsD. sang27. Kevin .................. a DVD last night.A. watchesB. watchingC. watchedD. is watching28. There’s ............... pineapple in the fridge.’ A. aB. an C. some D. any 29. Look! A policeman .........................after a man. A. is runningB. runs C. ranD. is run 30.“ What......................yesterday morning?” –“ I stayed at home to do my homework.” A. are you doingB. do you doC.were you doD. did you do31. How many floors..................? A. are there in yourschoolB. is your schoolhaveC.areschool have D. does your school has32. My father is a teacher. He .............at a school near our house.A. teachesB. teacher C. watches D. lives33. Last night I ...........dinner with my friends.A. have B. hadC. to have D. having34. Are Mum and Dad ......... at the moment ?A. workingB. workC. worksD. worked35. Mai is hungry. She’d like some...........A. noodleB. tea C. vegetable D. hot drink36. Ellen is very friendly. She is ................ rude.A. sometimesB. alwaysC. neverD. usually37. She listens to music......................A. two times a week B. a week twiceC. twice a weekD. two a week38. Luke can’t talk to you now. He .................. a bath.A. havingB. is havingC. hasD. had39. When are you .........vacation with your family, Lan?A. onB. byC. withD. to 40.Theyarrived in Ho Chi Minh city........................Monday morning.A. inB. onC. aD. to41. I suggest________some money for poor children.A. raiseB. to raiseC. raisedD. raising 42. My brother is......than me.A. much olderB. much elderC. most olderD. more older43. The.......of this city has increased rapidly in therecentyears.A. NumberB. PopulationC. CrowdD. Total44. Mary is interested .......................the history of Vietnam.A. in B. on C. at D. out45. Mr.Henry is................thanMrs. Henry.A.more carefulB.as carefulC.carefulD.

Không Tan Tuyết
20 phút trước

1.If you don’t listen to the teacher, you will be funished

2.If you don’t hurry up, we'll be late for the concert.

3.If you don’t  keep your feet dry, you will get a cold4.If you don’t go out more often, you will fall ill

5.If you promise to try harder, I will help you.

6.If practice speaking every day,you can improve your English

7.If you don’t do the homework, your parents will shout at you

8.If You don’t ride a bike carefully, you will fall down

9.If we don’t do morning exercise regularly, we will feel tired

10.If you don’t review the lessons, you will get bad marks

 
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