如果log4(log2^x)是表示外面的log以4为底,而里面的log以10或其它数(>0)为底的话,则log4(log2^x)=[log2(log2^x)]/2=log2(log4^x)=log2(2log2^x)[log2(log2^x)]/2=log2(2log2^x)log2(log2^x)=2log2(2log2^x)log2(log2^...