1)log_{\sqrt{2}}\frac{1}{4} = log_{2^{ \frac{1}{2} }}2^{-2}=-2*2*log_{2}2=-2*2*1=-42)log_{ \sqrt{3} } \frac{1}{9} = log_{3^{ \frac{1}{2} }}3^{-2}=-2*2*log_{3}3=-2*2*1=-43)log_{ \sqrt{3} }18-log_{3}4=2log_{3}18-log_{3}4=log_{3}18^{2}-log_{3}4==log_{3}324-log_{3}4=324:4=814)log_{ \sqrt{2} }12-log_{2}9=2log_{2}12-log_{2}9=log_{2}12^{2}-log_{2}9==log_{2}144-log_{2}9=144:9=16