a/ Cho m > 0 và m < 1. Chứng minh m2 < m. b/ Cho a > b. Chứng minh 2( 1 – a ) < 2 ( 1 – b)

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I. Complete the dialogue with appropriate sen sentences. Write the letters of the sentences (A - G) A. How do the Scot celebrate Hogmanay B. I've always wanted to spend New Year in Scotland C. Was the street crowded with people D. What did you do for your holidays last year E. What else happened at the Hogmanay celebration F. Did you go to the street party G. Oh, what a night Jane: I can’t wait for the Christmas and New Year holidays. Andrew: Me too. (1) __________________________________________________ Jane: Well, I spent time with my family at Christmas. And then I flew to Edinburgh to visit some friends and spend my New Year holiday with them. Andrew: Lucky you! (2) __________________________________________________ Jane: In Scotland, they call New Year’s Eve Hogmanay and it’s the most fun. Andrew: (3) ____________________________________________________________ Jane: They celebrate it with street parties, concerts, fireworks and fire spectaculars. Andrew: (4) _____________________________________________________________ Jane: Yes, of course. We went to Princes Street for a massive street party. Andrew: (5) _____________________________________________________________ Jane: Yes, very ... I heard there were about 80,000 people in attendance. Andrew: (6) _____________________________________________________________ Jane: There were loads of bands playing different live music, a laser show and a huge fireworks display at midnight from the Edinburgh castle. Andrew: (7) _____________________________________________________________ Jane: It’s my most memorable holiday. You should go and spend New Year in Scotland.