8^(-1/3)-(1/2)^log2 6-2lg(1/4)+4lg5
=（1/8）^(1/3) -2^log2(1/6) +2lg4 +4lg5
=1/2 -1/6 +4lg2+4lg5
=1/3 +4(lg2+lg5)
=1/3 +4
=13/3