㏒23 + ㏒34+ ㏒45 +㏒56 +㏒67+ ㏒78+ ㏒89= (其中㏒23指㏒以2 5 底3的对数 其

2025-01-19 17:18:57
推荐回答(2个)
回答1:

=㏒3/㏒2+㏒4/㏒3+㏒5/㏒4+㏒6/㏒5+㏒7/㏒6+㏒8/㏒7+㏒9/㏒8

你的题目应该是写错了,但有一个知识可供你参考

loga(b)*logb(c)=loga(c); loga(b)*logb(c)*logc(d)=loga(d).
log2(3)*log3(4)*log4(5)*log5(6)*log6(7)*log7(8)=log2(8)=3

回答2:

log(2,3)+log(3,4)+log(4,5)+log(6,7)+log(7,8)+log(8,9)
=log(2,3)+2log(3,2)+(1/2)log(2,5)+log(6,7)+3log(7,2)+(2/3)log(2,3)
=(5/3)log(2,3)+(1/2)log(2,5)+2log(3,2)+log(6,7)+3log(7,2)