Lg25+2\3Lg98+Lg5×Lg20＋Lg2×Lg2=?
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Lg25+2\3Lg98+Lg5×Lg20＋Lg2×Lg2=?Lg25+2\3Lg98+Lg5×Lg20＋Lg2×Lg2=?Lg25+2\3Lg98+Lg5×Lg20＋Lg2×Lg2=?Lg25+2\
Lg25+2\3Lg98+Lg5×Lg20＋Lg2×Lg2=?
Lg25+2\3Lg98+Lg5×Lg20＋Lg2×Lg2=?
Lg25+2\3Lg98+Lg5×Lg20＋Lg2×Lg2=?
Lg25+2\3Lg98+Lg5×Lg20＋Lg2×Lg2
=2-2lg2+2/3lg2+4/3lg7+(lg5)^2+2lg2lg5+(lg2)^2
=4/3lg2+4/3lg7+1
=1+4/3lg14