4.1^2/5
3.8^(-2/5)=(1/3.8) ^(2/5)
(-1.9)^-2/5=1.9^(2/5)
显然4.1>1.9> 1/3.8
因此
4.1^2/5 > (-1.9)^-2/5 >3.8^(-2/5)