1.设等比数列（An)的前n项和为Sn,若S6/S3=3,则S9/S6=?2.在等比数列（An)中,若A1+A2=162,A3+A4=18,那么A5+A6=?3.等差数列（An)的公差d不等于0,若A1,A3,A9成等比数列,则A1+A3+A9/A2+A4+A10=?4.已知等比数列的是首项
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