fyqt.net
当前位置:首页 >> log3(9)=2? 为什么啊 >>

log3(9)=2? 为什么啊

换底公式:loga(b)=logc(b)/logc(a) 左边换成以3为底 =log3(2)/log3(9)=右边

log(老哥)以三为底九的对数等于二!望采纳!谢谢!

log2(9)=log2(3²)=2log2(3) ∴log2(9)×log3(2)=2log2(3)×log3(2) =2×1 =2 望采纳

log(3)9=log(3)3^2 =2log(3)3 =2x1 =2.

解析 可以这么来做 log3 9^(-1) =-log3 9 =-2 希望对你有帮助 学习进步O(∩_∩)O谢谢

(log3 2+log9 2)*(log4 3+log8 3) =(lg2/lg3+lg2/lg9)*(lg3/lg4+lg3/lg8) =(lg2/lg3+lg2/2lg3)*(lg3/2lg2+lg3/3lg2 =3/2*lg2/lg3*5/6*lg3/lg2 =3/2*5/6=5/4

log2 12-log2 4=log2 (12/3)=log2 3

网站首页 | 网站地图
All rights reserved Powered by www.fyqt.net
copyright ©right 2010-2021。
内容来自网络,如有侵犯请联系客服。zhit325@qq.com