已知log(2 )(3)=M,试用M表示 log(6)(9)=?

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/19 04:33:51
已知log(2 )(3)=M,试用M表示 log(6)(9)=?
xQn0}ҤFEu$nryI]RU57OThrWiK)Лe9\+W;%faKXqc&3czr|IBr$[esAWf٫9 #g`h7pF=țԳYEnM(zZ 6g64mZXchqRbAl!n60XKHG\?Z^4=zaV8lS+rn,t!^D@ʲ&9$y7%1HMZ37Mg^8'Qr/)B)byuj -YU05 8'I=_$8ҎU?jlM&:8L;Wߚ,={hԍ,|67G "ƟcRAV(r,* *{ MkEFk~ZiS

已知log(2 )(3)=M,试用M表示 log(6)(9)=?
已知log(2 )(3)=M,试用M表示 log(6)(9)=?

已知log(2 )(3)=M,试用M表示 log(6)(9)=?

相等
=m
应该是

楼主你好
log(6)(9)=log(2)(9)/ log(2)(6)
= 2log(2)(3)/1+log(2)(3)
= 2m/1+m
满意请点击屏幕下方“选为满意回答”,谢谢。


根据换底公式:
log(2)(3)=lg3/lg2=M
log(6)(9)=lg9/lg6=2lg3/(lg2+lg3)
=1/[(lg2+lg3)/(2lg3)]
=2/[(lg2+lg3)/(lg3)]
=2/[(lg2/lg3)+1]
=2/[(1/M)+1]
=2M/(M+1)