正等比数列中,A4A5=32,LOG2A1+LOG2A2+...+LOG2A8=?

问题描述:

正等比数列中,A4A5=32,LOG2A1+LOG2A2+...+LOG2A8=?

log2a1+log2a2+...+log2a8=log2[a1*a2*..*a8]=log2(32^4)=4log2(32)
=4log2(2^5)=20