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LA

le tuan anh
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Số lượng câu hỏi 14
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LA

Bài 3: Cho tam giác ABC, trung tuyến AM. Trên tia  đối của tia MA lấy D sao cho MD = MA.
a) Cm: AB // CD và AB = CD
b) Gọi E, F lần lượt là trung điểm của AC, BD. AF cắt BC tại I, DE cắt BC tại K. Cm I là trọng tâm ABD,  K là trọng tâm  ACD. 
c) Cm BI = IK = KC
d) Cm E, M, F thẳng hàng.

 
LA

giúp mik với

Cho ABC vuông tại A. Kẻ BD là phân giác của góc ABC (DAC). Trên đoạn BC lấy điểm E sao cho AB=BE.⦁ Chứng minh : AD = DE⦁ Trên tia đối của AB lấy điểm F sao cho AF = EC. Chứng minh : BD  FC⦁ Chứng minh AE // FC⦁ Chứng minh ba điểm D,E,F thẳng hàng
LA

giúp mik với

Câu 4. (1,5điểm) Cho tam giác abc

  cân tại A có BE và CF là các đường cao. Cho tam giác ABC cân tại A (góc A < 90 độ).
a) Chứng minh BE = CF.
b) Gọi H là giao điểm của BE và CF. Chứng minh BE + BF > BH + CH.

 
LA

Cho tam giác ABC vuông tại A có AB < AC. Trên cạnh BC lấy điểm H sao cho HB = BA, từ H kẻ HE vuông góc với BC tại H (E thuộc AC) 
a) Chứng minh:   
b) Chứng minh: Tam giác AEH cân tại E.
c) Chứng minh: BE là đường trung trực của AH.
d) Gọi K là giao điểm của HE và BA. Chứng minh: BE vuông góc KC
LA
LA

1: Trình bày những nét chính về sự phát triển của nền kinh tế thời Lê sơ nói chung và nông nghiệp nói riêng? Hãy chỉ ra nguyên nhân của sự phát triển đó.

 
LA

1. Nam leaves home at 7 o’clock
2. He teaches English at the high school.
3. The lesson is very difficult.
4. She often does the housework after doing exercises.
5. They are planting some roses in the garden.
6. It’s about 8 km from my house to school.
7. Yesterday, I went to Hung King Festival with my friends.
8.Nam often goes to school by bike.
9. They go to the beach on the summer holidays
10.There are often traffic jams in the city centre in rush hour

 
LA

I. Circle the word( A,B, C or D) whose underlined part is pronounced differently 1. A. album B. battle C. addictive D. athletics2. A. cricket B. detective C. affect D. dentist3. A. started B. filled C. visited D. needed4. A. hour B. house C. hot D. healthy5. A. school B. chemistry C. children D. character6 .A. asked B. stopped C. called D. watched7. A. think B. this C. mother D. the8.A. brushed B. changed C. combed D. ironed9. A. absent B. disease C. poster D. essay11. A. usually B. unhappy C. uniform D. useful10. A. decided B. fitted C. needed D. watched12. A. filled B. worried C. stayed D. noticed13. A. armchair B. kitchen C. catch D. chemistry14. A. post B. closet C. police D. phone15. A. math B. month C. with D. both16. A. distance B. family C. different D. library17. A. which B. whole C. where D. what18. A. helped B. rented C. talked D. watched19. A. baseball B. ask C. participate D. basketball20. A. healthy            B. ahead C. bread D. seatbelt21. A. hey B. honey C. obey D. grey22. A.fly B. why C. happy D. height23. A. obey B. key C. grey D. survey24. A. plane           B. safety C. traffic D. station25. A. near  B. here C. clear D. there26. A. sign B. ride                         C. listen D. drive27. A. traffic B. pavement                 C. plane              D. station28. A. that            B. thank                C.think                D. three29. A. breakfast         B. teacher              C. East                       D. please30. A. lazy B. date C. hate D. carII. Choose the words that have the different stress from the others1.A. silent           B. noisy C. pretty D. polite2. A. station           B. season C. sandal D. police3.A. agree                 B. hurry                          C. enter                      D. visit4.A. describe B. fasten C. listen D. hover5.A. degree               B. student C. funny D. widen6.A. traffic           B. dancer C. cycling D. balloon7. A. central B. gripping C. complete D. boring8.A. answer          B. listen                  C. enter                          D. obey9.A. station    B. healthy            C. safety D. alone10.A. tidy               B. complete C. extend D. mistake 11. A. dangerous   B. plentiful C. another D. limited 12. A. easily              B. energy   C. consumption D. negative13.A. convenient         B. abundant             C. different                D. expensive14.A. petroleum B. advantage C. tendency D. enormous15.A. attention B. pollution C. holiday           D. effective16. A. aquarium B. material C. appointment D. temperature17. A. adventure B. detective C. cucumber D. invention18. A. traffic B. agree C. noisy D. student19. A. listen B. visit C. borrow           D. obey20. ticket B. costume C. event D. number
LA
LA

I: Choose the best answer (A, B, C or D)1. Big cities often ………………..from traffic jams every day.A. cross B. suffer C. start D. come2. What must you do before you turn left or right when ……………a motorbike?A. holding B. taking C. making D. riding3. The traffic…………….tell people to do, warns people about possible dangers in the street.A.jams B. signs C. lights D. rules4. There should be a ……………..limit in the playground to prevent accidents.A.speed B. time C. engine D. cost5. …………….. does it take to go from Ha Noi to Ho Chi Minh City by plane?A. How far B. How much C. How long D. How many6. The festival ……………place every two years.A. takes B. happens C. has D. holds7. Mai’s dad usually drives her to school …………… her school is very far from her house.A. but B. though C. because D. or8. During Tet holiday, the ……………. atmosphere is felt around the country.A. local B. ethnic C. thankful D. festival9. People wear beautiful ……and parade through the streets during the festival in this country.A.jeans B. gloves C. boots D. costumes10. People put pumpkin ……………… outside the homes during Halloween.A. lights B. lanterns C. neon lights D. bulbs11. The biggest ………………….for the winner is a trip to France.A.part B. benefit C. prize D. mark12.It will be …… to ride a jet pack in bad weather because it doesn’t have a roof.A. comfortable B. pleasant C. unpleasant D. enjoyable13.With teleportation, you disappear at a place, and then …. in another place seconds later.A. appears B. appeared C. reappear D. reappears14.My brother and I often come to school ….. foot.A. at B. in C. by D. on15. The white cat is Helen’s, and the black cat is …….A. my B. I C. mine D. of mine16. A sky safety system can help cars to …… traffic jams and crashes.A. use B. have C. prevent D. takeA. automatic B. driverless C. pilotless D. man17. This is Linda’s hat, and those shoes are ……..A. our B. hers C. her D. their18.Skycycling tubes will be easy ……..A. ride B. to drive C. drive D. to ride19. I think we ….. have electric taxis very soon.A. may B. might C. will D. would20. Every day over 1,000 new cars add to the city and the city of over 20 million people is getting more and more ……A. difficult B. famous C. expensive D. gridlocked21. Which ….. of transport do you think will be used in the future?A. mean B. mean C. meanings D. meaning22. A jet pack doesn’t …. a lot of space.A. occur B. bring C. take D.. have23 .The city is facing serious ….. problems.A. pollution B. polluted C. pollute D. pollutant24. We will use more ….. energy in the future.A. sun B. sunn C. solar D. sunlight25.We are looking for types of vehicles that help us to avoid ……A. walking B. traffic jams C. rush hours D. traffic26.We believe that urban transport pods can travel ….. around 30kph.A. in B. at C. with D. on27.People won’t use flying cars …… the year 2050.A. after B. before C. during D. until28. Look at ................ kangaroos. They're hopping on their hind legs.A. a B.the  C.an D. x29. The USA is .......................large country in North America.A. a B.the  C.an D. x30. London has ........................... population of about nine million.A. a B.the  C.an D. x31. Autumn is ...................... most beautiful season in my home town.A. a B.the  C.an D. x32. The films was so ………………that we almost fell asleep.A.interesting B. gripping C. boring D. violent33. Critics were all ………………at their performance on the stage yesterday.A.disappointed B. annoyed C. worried D. bored34. The film is a big ………………….because the audience enjoy it a lot.A.failure B. start C. finish D. success35. The film is based on a book that was ………………fifteen years ago.A.read B. opened C. written D. closed36 .My father liked the ____________ of that singer.A. perform B. performer C. performance D. performing37.The play was so boring. ________, An saw it from beginning to end.A. Therefore B. Despite C. However D. Although38. How far is it…………………..Hanoi to HCMC ?A. at B. in C. to D. from39. How ___________ is the blue hat? It's 50,000 dong.A. far B. many C. old D. much40. What about ___________to school every morning?A. going B. go C. to go D. went