的展开式中常数项为 ▲ (请用数字作答)
已知两个数k+9和6-k的等比中项是2k,则k=________.
等比数列{an}中,a1>0,a2a4+2a3a5+a4a6=36,则a3+a5=________.
{an}为等比数列,a2=6,a5=162,则{an}的通项公式an=________.
设Sn是等比数列{an}的前n项和,若a1=1,a6=32,则S3=________.
设等差数列{an}的前n项和为Sn,Sm-1=-2,Sm=0,Sm+1=3,则m=________.