原式=2lg5+2/3lg2^3+lg5*[lg(2*10)]+lg²2
=2lg5+2lg2+lg5(lg2+lg10)+lg2*lg2
=2(lg2+lg5)+lg5*lg2+lg5+lg2*lg2
=2lg10+lg2(lg5+lg2)+lg5
=2+lg2+lg5=2+lg10=3