设log(18)(9)=a log(18)(5)=b ,用ab表示log(36)(45)设log(18)(9)=a log(18)(5)=b ,用ab表示log(36)(45)
问题描述：
设log(18)(9)=a log(18)(5)=b ,用ab表示log(36)(45)
设log(18)(9)=a log(18)(5)=b ,用ab表示log(36)(45)
答
2log(18)(3)=a
log(18)(5)=b
2lg3/lg18=a
lg5/lg18=b
答
log18(9)=log9（9）/log9(18)=1/【log9(2)+1】=alog9（2）=1/a-118^b=5log18(5)=b=log9(5)/log9(18)log9(5)=b【log9（18）】=b/alog36(45)=log9(45)/log9(36)=【log9(5)+1】/【2log9（2）+1】=【b/a+1】/【2/a-2+1】...