Cho tam giác ABC vuông tại A; có AB<AC.M là trung điểm BC.Gọi D là điểm đối xứng với A qua M,E là điểm đối xứng với A qua đường thẳng BC. a)Chứng minh AC=BD b)Tứ giác BCDE là hình gì? c)Gọi H là giao điểm AE và BC.Vẽ tia Ax song song Hd và cắt BC tại I.Chứng minh DI=EH

Tại sao phải uống nhiều nước tỏng mùa hè? nước cam có tác dụng gì

Cho tam giác ABC vuông tại A có AH là đg cao. Trên tia đối của Ac lấy E bất kì. Gọi K là hình chiếu của A trên BE, chứng minh

1. It was a ___ attack ( sudden ) 2. She is ___ nice ( pretty ) 3. How _____ he runs! ( slow ) 4. His advise is very ____ ( useful ) 5. The children behaved very ___ ( good )

73. My father ________ his work before lunch time. A. finished B. had finished C. finish D. will finish 74. John ________ away before his parents punished him. A. went B. is going C. has gone D. had gone 75. Yesterday If I ________ her, I would have helped her a lot. A. had known B. is knowing C. has known D. knew 76. The party chairman only _______a statement after there _______ a lot of speculation in the press. A. makes / had been B. made / had been C. had made / will be D. was making / was 77. Helen _______ hospital treatment for a year before the doctors finally _______her their diagnosis. A. will receive / is telling B. had received / told C. receive / tell D. received / had told 78. Sharon eventually ________ the job she ________ last year, although she ________ the year before. A. finds / wants/ graduates B. found / wanted/ had graduated C. found / wanted/ graduated D. finds / had wanted/ graduated 79. When the doctors________ at the scene of the accident, they ________ victims still ________. A. arrived / realized / were breathing B. were arriving / realized / breathed C. arrived / had realized / breathed D. were arriving / were realizing / were breathing 80. I suddenly ________ the Tower Square. I ________ there ten years before. A. recognized / was B. was recognizing / was C. recognized / had been D. had recognized / had 81. Nam ________ smoking two years ago. A. stops B. has stopped C. stopped D. is stopping 82. They ________ in our country since January, 1st 2002. A. are B. have been C. were D. had been 83. Lan: I work for a big company. → Lan said she________ for a big company. A. had worked B. work C. worked D. is working 84. He started working as a teacher five years ago. A. He has been working as a teacher for five years. B. He has worked as a teacher since five years. C. He is working as a teacher since five years. D. He had been working as a teacher for five years 85. After he ________ his English course, he went to England to continue his study. A. has finished B. had finished C. was finished D. would finish 86. The Browns_______ here since 1990. A. live B. are living C. have lived D. had lived 87. I wish I _______ all about this some weeks ago. A. knew B. have known C. had known D. would know 88. He said that he _______ his bicycle the night before. A. has lost B. loses C. had lost D. lost 89. As the sun _________ , I decided to go out. A. shines B. has shine C. shine D. was shining 90. By the time the police arrive, the thieves________ the stolen things. A. hide B. had hidden C. are hiding D. will have hidden 91. She came into the room while they _______ television A. have watched B. watched C. have been watching D. were watching 92. The baby_________ non-stop for half an hour. A. cried B. is crying C. has been crying D. was crying 93. Mr. Smith said he would come but he_________ yet. A. did not come B. had not come C. does not come D. has not come 94. By the time we get out of this traffic jam, all the guests _______ home. A. have gone B. had gone C. will go D. will have gone 95. All the guests _______ home by the time you come to the party. A. have gone B. had gone C. will go D. will have gone 96. Sorry. I can’t go there with you now. I _________ my homework at present. A. did B. do C. was doing D. am doing 97. She always _________ dates on the holidays. A. have B. had C. has had D. has 98. Last year, they _________ to Europe with their best friends on their summer holidays. A. visited B. traveled C. will travel D. are visiting 99. What are you going to do this weekend?- We _______ visit our grandfather in the countryside. A. are going to B. were going to C. have gone to D. went 100. Our Singaporean friends_______________ to visit our school last year. A. is coming B. come C. came D. have come

31. The car is old but reliable; so far it hasn’t let me _______. A. down B. up C. in D. through 32. There’s been no _______ the weather for nearly three days now. It’s rained non-stop. A. improvement of B. improvement for C. improving D. improvement in 33. The gun went _______ as he was cleaning it but luckily he wasn’t hurt. A. out B. off C. by D. over 34. When the alarm went off, Mick just turned _______ and went back to sleep. A. down B. up C. over D. out 35. I really like Joe’s dad but I don’t get _______ with his mother at all. A. on B. by C. out D. through 36. Young children often express their anger by having temper _______. A. attacks B. tantrums C. fits D. spells 37. He should have phoned the police. However angry he was, he shouldn’t have _______ the laws into his own hands. A. taken B. held C. had D. grasped 38. The assistant suggested _______ the next day when the manager would be there. A. we are coming back B. we came back C. we will come back D. to come back 39. Why don’t you both come _______ for dinner on Thursday? Kate and Bill are coming. A. round B. in C. through D. past 40. By cutting down trees we _______ the natural habitat of birds and animals. A. harm B. damage C. hurt D. injure

giúp mik với mik huaqs cho 5 sao và ctlhn

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Tìm x, y thuộc Z, biết: xy - 2x = 19

giúp với nha mn mk cảm ơn nhiều hình dưới thiếu nên mk thêm nha: B=1-1/5.10-1/10.15-1/15.20-...-1/95.100