题目内容
(log23+log49+log827+…+
3n)×log9
=________________.
![]()
解析:
原式=(log23+
32+
33+…+
3n)×
log932
=nlog23×
log932=log23·log932=log23·
=
.
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题目内容
(log23+log49+log827+…+
3n)×log9
=________________.
![]()
原式=(log23+
32+
33+…+
3n)×
log932
=nlog23×
log932=log23·log932=log23·
=
.