Tính `1+1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90+1/110+1/132+1/156+1/182+1/210+1/240+1/272`

Cần gấp trước 2h giúp vs nhanh nhất có thể E. WRITING I. Finish each of the following sentences in such a way that it means exactly the same as the sentence printed before it. 71. He won a prize at the competition because he spoke English fluently. Because of _______________________________________________________________. 72. Nowhere is more expensive than this restaurant. This restaurant ____________________________________________________________. 73. Mr. Lee said to his students Mr. Lee advised ____________________________________________________________. She wanted to know ________________________________________________________. 75. I last saw him when I was a student. I haven't __________________________________________________________________. II. Use the following sets of words and phrases to write a letter from Lilly to Elizabeth. Dear Elizabeth, 76. I / be / glad / receive / letter. 77. I / just / wonderful / news. 78. I / pass / final / examination / university. 79. My father / be / please / he / hear this. 80. He / already / promise / pay / holiday abroad / I / pass. 81. So / I / come / England. 82. I / like / study English / school / near / home. 83. I / look for / advanced course / perhaps / three / four hours / day. 84. You / help / find / one? 85. I / look forward / see / soon. Love, Lilly

Tìm giá trị lớn nhất của biểu thức $P$ $=$ $\sqrt{x+1}$ $-$ $\sqrt{x-8}$

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rút gọn nhanh nha

Các cao nhân giúp với ạ , có 1 ít

101. Visitors complained about the (organize) ___________________ in the old museum. 102. When Jenny made up for the play, she was (recognize) __________________. 103."Time of our lives" was the (office)________________song of the World Cup 2006. 104. Tom was accused of stealing some (confidence) ________________ documents. 105. The cost of (admit)________________ to the show is quite reasonable. 106. I watch the news everyday because it very (inform) ________________. 107. I (sleep)________________ this morning and was late for school. 108. He hoped the (employ) _________________ agency would find him a job. 109. Our school has a lot of (qualify)________________teacher .

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Read the first sentence, and then complete the second sentence with the same meaning. 1. That meal was excellent.  What ..............................................................................................................! 2. I don’t really want to visit the museum.  I’d rather ................................................................................................................ 3. Please don’t smoke in this area of the restaurant.  Customers are requested ....................................................................................... 4. Although he took a taxi, Peter arrived late for the concert.  In spite ................................................................................................................... 5. I left without saying goodbye as I didn’t want to disturb the meeting.  Rather .................................................................................................................. 6. He regrets having invited her to the party.  He wishes ............................................................................................................... 7. It was such a dirty beach that we decided not to stay.  The beach .................................................................................................................................................. 8. It isn’t necessary to finish the work today.  You don’t ......................................................................

Phương trình: x^2 - 2(m + 2)x + m^2 - 4 = 0. Tìm m để phương trình trên có 2 nghiệm phân biệt thỏa mãn x1/x2 - x2/x1 = 8