解:0.2^0.6 = (0.2^3)^0.2 = 0.008^0.20.3^0.4 = (0.3^2)^0.2 = 0.09^0.2对于y=x^a,y随着x增大而增大。因为0.09>0.008,所以0.09^0.2>0.008^0.2,即0.3^0.4>0.2^0.6。