a=2^(-1/3)=(1/2)^(1/3)=(1/4)^(1/6),b=3^(-1/2)=(1/3)^(1/2)=(1/27)^(1/6)∵1/4>1/27,∴1>(1/4)^(1/6)>(1/27)^(1/6)>0,即1>a>b>0∴c=loga(b)>1∴c>a>b望采纳