Cách `1 :`
`( 1/3 + 2/5 ) x 3/4`
`= 11/15 x 3/4 `
`= 11/20 `
Cách `2`
`= 1/3 x 3/4 + 2/5 x 3/4`
`=1/4 + 3/10`
`=5/20 + 6/20`
`=11/20`
Cách 1 :
`(1/3 + 2/5) × 3/4`
`= 11/15 × 3/4`
`= 11/20`
Cách 2 :
`= 1/3 × 3/4 + 2/5 × 3/4`
`= 1/4 + 3/10`
71. John ________ his parents in France at the moment. He ________ in New York, but ________ his parents for the past few weeks. A. was visiting / live / had visited B. has visited / lived / is visiting C. is visiting / lives / has been visiting D. has been visiting / had live / has been visiting 72. -________ to come over for dinner tonight? - Oh, I’m sorry, I can’t. I _______ to a movie tonight with some friends. A. Have you wanted / will go B. Did you want / went C. Do you want / am going D. Are you wanting / go 73. He _______ a good day until a thief ________ into his apartment, _______ all his money, and _______ him up. A. has been having / comes / takes / tied B. had been having / came / took / tied C. was having / had came / took / tied D. is having / is coming / has take / ties 74. - Where ________ on holiday? - I don’t know. We ________ yet. A. will you go / are not going to decide B. are you going / have not decided C. have you gone / do not decide D. did you go / had not decided 75. When I ________ the street I ________ somebody call my name. A. have crossed / hear B. had crossed / would hear C. am crossing / will hear D. was crossing / heard 76. The train ________ at 8.58, so we ________ in Scotland by lunchtime. A. leaves / will be B. left / have been C. has left / were D. left / had been 77. I think by the time we ________ there, Jim ________ A. get / will have left B. got / has left C. will get / will leave D. had got / left 78. I ________ the time when I ________ as a teacher. A. have never forgot / have first worked B. am never forgetting / first work C. will never forget / first worked D. had never forgot / was first working 79. Women ________ in presidential elections since 1921. A. vote B. have voted C. had voted D. are voting 80. By the time the boss ________ at 9.00, his employees ________ for two hours. A. will arrive / are working B. arrives / will have been working C. arrived / have been working D. has arrived / were working 81. - I am hungry. I ________ lunch yet. - Don’t worry. I ________ you a sandwich. A. have not had / will get B. do not have / am going to get C. will not have / have got D. am not having / get 82. Do you think everything ________ when we ________ from the store? A. will be finished / get back B. is finished / will get back C. is going to finish / are getting back D. has been finished / will have got back 83. Look! Mary ________ a beautiful new dress. She ________ so pretty in the dress. A. was wearing / looked B. wears / has looked C. has been wearing / is looking D. is wearing / looks 84. I am sick of rain and bad weather! Hopefully, when we ________ up tomorrow morning, the sun ________. A. will wake / will shine B. are waking / shines C. are going to wake / is shining D. wake / will be shining 85. When the president ________ off the plane, the crowd ________ for him for half an hour. A. gets / will wait B. got / had been waiting C. had got / was waiting D. has got / will be waiting 86. Jane ________ at my house when you ________ A. is / will arrive B. will be / will arrive C. will be / arrive D. is / are going to arrive 87. They ________ here for three years before you ________ last week. A. have worked / came B. have been working / come C. was working / had come D. had been working / came 88. These students ________ hard since the beginning of the school year because they ________ their graduation exam next May. A. studied / are going to take B. are studying / will be taking C. study / will have taken D. have been studying / will take 89. The students ________ chapter 5 next week, so they ________ to prepare for It now. A. have studied / will read B. are studying / have read C. will study / read D. will be studying / are reading
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giải giúp mình với mình cảm ơn nhiều ạ
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