(2)将3-3=化成对数式;
(3)已知log4x=-,求x;
(4)已知log2(log3x)=1,求x.
解:(1)25=32.
(2)log3=-3.
(3)∵log4x=-,∴x=4=2-3=.
(4)∵log2(log3x)=1,∴log3x=21.
∴x=32=9.