1,用换底公式,都换成以3为底的对数.log3(2)[log4(3)+log8(3)]=log3(2)[1/log3(4)+1/log3(8)]=log3(2)[1/2log3(2)+1/3log3(2)]=1/2+1/3=5/62.用换底公式,都换成以3为底的对数.log1/3(√27)+log27(1/3)=log3(√27)/log...