16.【答案】01【解析】数列{an}为等差数列,∴S3=a1+a2+a+a4+a3=54=15,即a=3,又∵的=5,d=5-81,∴a=5+(n3)=n,一1一(n+1)n所求值为mg+2-言200201

词第二节书面表达Dear saraHearing that next Tuesday is your birthday, I, onbehalf of the whole class, am writing to express oursk best wishes and invite you to attend a birthday partywe will hold for youWe plan to hold the birthdayInouIclassroom on Sunday evening. Thewill beelegant with wonderful performances by students andteachers, including singing and dancing. Each of uswill give you a present to show our gratitude to yourgenerous help as well as your great devotion andefforts. Hopeful\syou will like the giftsWish you happy birthday and have a good time inthe party!Yours.Li Hua

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