题目

 The happy smile on her face suggests that she _______ to the party tomorrow evening. A. is about to   B. should go      C. will go       D. would have gone    答案:C9.(1)在等差数列{an}中,d=2,n=15,an=-10,求a1及Sn.(2)在等比数列{an}中,已知a1=-1,a4=64,求q及S3.
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