数学计算 对数函数 急啊!

log4 9(4为底,9为真）=log8 27=.=log2^n 3^n=log2 3
故等于 nlog2 3 *log9^n 32^1/2
等于5/2 * lg3/lg2 *lg2/lg3
=5/2
题中,log9^n 32^1/2=5/2n log3 2
log2 3=lg3/lg2
log3 2=lg2/lg3
(2)lgx=2lga=3lgb=6lgc
原式=lgx/lg abc =lgx/((1/2+1/3+1/6)lg x)=1