lg5^2+lg8^2/3+lg5*lg20+(lg2)^2=?

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lg5^2+lg8^2/3+lg5*lg20+(lg2)^2=?
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lg5^2+lg8^2/3+lg5*lg20+(lg2)^2=?
lg5^2+lg8^2/3+lg5*lg20+(lg2)^2=?

lg5^2+lg8^2/3+lg5*lg20+(lg2)^2=?
原式
=2lg5+(2/3)lg8+lg5*lg20+(lg2)^2
=2lg5+2lg2+lg5*(lg5+2lg2)+(lg2)^2
=2lg5+2lg2+(lg5)^2+2lg2lg5+(lg2)^2
=2lg10+(lg5+lg2)^2
=2+1
=3