∵log底数2[log底数3(log底数4（x）)]=log底数3[log底数4(log底数2(y))]=log底数4[log底数2(log底数3z)]=0,∴log底数3(log底数4（x）)=log底数4(log底数2(y))=log底数2(log底数3z)=1,∴log底数4(x)=3log底数2(y)=4lo...