原式=lg5lg8+3*lg5+lg2^3lg2-2
=lg5*lg8+3*lg5+lg8*lg2-2
=lg8(lg5+lg2)+3*lg5-2
=lg8*lg10+3*lg5-2
=lg8+3*lg5-2
=3*(lg2+lg5)-2
=3*lg10-2
=3-2
=1