27^(-1/3)-(-1/2)^log2（下面的）4（上面的）-2lg1/4+4lg5
=1/3-(-1/2)^2-2lg2^(-2)+4lg5
=1/3-1/4+4lg2+4lg5
=1/12+4(lg2+lg5)
=1/12+4
=49/12