lg125+lg8+lg5lg20+(lg2)^2=
问题描述:
lg125+lg8+lg5lg20+(lg2)^2=
答
原式=3lg5+3lg2+(lg5)^2+2*lg2*lg5+(lg2)^2 =3+(lg5+lg2)^2 =4
lg125+lg8+lg5lg20+(lg2)^2=
原式=3lg5+3lg2+(lg5)^2+2*lg2*lg5+(lg2)^2 =3+(lg5+lg2)^2 =4