lg5^2+lg4+lg5*lg20+(lg2)^@

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lg5^2+lg4+lg5*lg20+(lg2)^@
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lg5^2+lg4+lg5*lg20+(lg2)^@
lg5^2+lg4+lg5*lg20+(lg2)^@

lg5^2+lg4+lg5*lg20+(lg2)^@
lg5^2+lg4+lg5*lg20+(lg2)^2
=lg25+lg4+lg5*(1+lg2)+(lg2)^2
=lg25×4+lg5+lg5lg2+(lg2)^2
=lg100+lg5+lg2(lg5+lg2)
=2+lg5+lg2
=2+lg10
=3

lg5^2+lg4+lg5*lg20+(lg2)^2
=lg25+lg4+lg5*(1+lg2)+(lg2)^2
=lg25×4+lg5+lg5lg2+(lg2)^2
=lg100+lg5+lg2(lg5+lg2)
=2+lg5+lg2
=2+lg10
=3
事实!!!