(0.25)^(1/2)×(-1/27)^(-2/3)
=(1/4)^(1/2)×(-1/27)^(-2/3)
=[(1/2)^2]^1/2×[(-1/3)^3]^(-2/3)
=(1/2)^(2×1/2)×(-1/3)^(-3*2/3)
=1/2×(-1/3)^(-2)
=1/2×1/(-1/3)^2
=1/2×1/(1/9)
=1/2×9
=9/2
(0.25)^(1/2)×(-1/27)^(-2/3)
=(1/4)^(1/2)×(-1/27)^(-2/3)
=[(1/2)^2]^1/2×[(-1/3)^3]^(-2/3)
=(1/2)^(2×1/2)×(-1/3)^(-3*2/3)
=1/2×(-1/3)^(-2)
=1/2×1/(-1/3)^2
=1/2×1/(1/9)
=1/2×9
=9/2