题目

根据语境及所给汉语或音标提示写出所缺单词。【1】Those ________ (迷) are waiting at the airport to meet their favourite star.【2】Carla ________ (希望) she can take a plane to New York.【3】Messi is my favourite football ________ (运动员).【4】Paul’s mother wants to have a ________(/’sekənd/) baby.【5】The boy says he knows ________(/’nʌθɪŋ/) about that team.已知数列的前n项和为，且.（1）求出数列的通项公式；（2）记，求数列的前n项和.