log以4为底8的对数-log以9分之1为底3的对数-log以根号2为底4的对数
＝lg8/lg4-lg3/lg(1/9)-lg4/lg(√2)
＝3lg2/2lg2-lg3/(-2)lg3-2lg2/(1/2)lg2
=3/2 +1/2-4
=-2