tính: (1+7/9).(1+7/20).(1+7/33)....(1+7/273)

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Ex1: CHUYỂN CÁC CÂU SAU SANG BỊ ĐỘNG. 1. They told me that you were the best architect in this city. ->…………………………………………………………………………………………………… 2. She reported that the flowers were killed by frost. ->…………………………………………………………………………………………………… 3. Some people inform me that the director is going to take a business trip to England. ->…………………………………………………………………………………………………… 4. That officer announced that the meeting was delayed until next week. ->…………………………………………………………………………………………………… 5. He discovered that this cotton was grown in Egypt. ->…………………………………………………………………………………………………… 6. They promise that the performance will start on time. ->…………………………………………………………………………………………………… 7. He recommends that we should stay at the city center. ->…………………………………………………………………………………………………… 8. We believed that Alice would pass the driving test. ->…………………………………………………………………………………………………… 10. They have persuaded me that they will go with me to the stadium. ->…………………………………………………………………………………………………… 12. People think that Maradona is the best football player in the 20th century. ->…………………………………………………………………………………………………… 13. They find that the job is not suitable for a girl like her. ->…………………………………………………………………………………………………… 14. The teacher explained that this powerful engine pulled the train. ->…………………………………………………………………………………………………… 15. He told me that his football team had played well last season. ->……………………………………………………………………………………………………