0.4的负2.5次方 = (0.4)^(-2.5) = (2/5)^(-5/2) = (5/2)^(5/2) 2的1.6次方 = 2^(1.6) = (4/2)^(8/5) 底数(5/2)>(4/2)>1 幂数 (5/2)>(8/5)>1 所以 (5/2)^(5/2) > (4/2)^(8/5) 即 0.4的负2.5次方 > 2的1.6次方...