(lg根号27+lg8-3lg根号10)/lg1.2=(lg3^(3/2)+lg2^3-3/2lg10)/lg1.2=(3/2*lg3+3/2*lg4-3/2lg10)/lg1.2=3/2[lg3+lg4-lg10]/lg1.2=3/2lg(3×4/10)/lg1.2=3/2lg1.2/lg1.2=3/2