4.1^(2/5)＞1
0＜3.8^(-2/3)=1/3.8^(2/3)＜1/1=1
(-1.9)^(3/5)＜0
所以4.1^(2/5)＞3.8^(-2/3)＞(-1.9)^(3/5)