lg125+lg8+lg5lg20+(lg2)^2=

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lg125+lg8+lg5lg20+(lg2)^2=

lg125+lg8+lg5lg20+(lg2)^2=
lg125+lg8+lg5lg20+(lg2)^2=

lg125+lg8+lg5lg20+(lg2)^2=
原式=3lg5+3lg2+(lg5)^2+2*lg2*lg5+(lg2)^2 =3+(lg5+lg2)^2 =4