log3[log4(log5a)]=log4[log3(log5b)]=0那么,对于log3[log4(log5a)]=0有 log4(log5a)=1因此 log5a=4a=5^4对于 log4[log3(log5b)]=0有 log3(log5b)=1因此 log5b=3b=5^3于是 a/b=5^4/5^3=5