问题
选择题
等比数列{an}中,an>0,a3a4=4,则log2a1+log2a2+…+log2a6值为( )
A.5
B.6
C.7
D.8
答案
在等比数列中,a3a4=a1a6=a2a5=4,
log2a1+log2a2+…+log2a6=log2(a1a2…a6)=log226=6.
故选:C.
等比数列{an}中,an>0,a3a4=4,则log2a1+log2a2+…+log2a6值为( )
A.5
B.6
C.7
D.8
在等比数列中,a3a4=a1a6=a2a5=4,
log2a1+log2a2+…+log2a6=log2(a1a2…a6)=log226=6.
故选:C.