lg25+2/3lg8+lg5×lg20+(lg^2)2
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lg25+2/3lg8+lg5×lg20+(lg^2)2lg25+2/3lg8+lg5×lg20+(lg^2)2lg25+2/3lg8+lg5×lg20+(lg^2)2lg25+2/3lg8+lg5×
lg25+2/3lg8+lg5×lg20+(lg^2)2
lg25+2/3lg8+lg5×lg20+(lg^2)2
lg25+2/3lg8+lg5×lg20+(lg^2)2
lg25+2/3lg8+lg5×lg20+(lg^2)2 =2lg5+2lg2+lg5*(lg5+2lg2)+(lg2)^2 =2(lg5+lg2)+(lg5)^2+2lg5*lg2+(lg2)^2 =2lg(2*5)+(lg5+lg2)^2 =2*1+1 =3
lg25+2/3lg8+lg5×lg20+(lg^2)2 =2lg5+2lg2+lg5×(lg5+2lg2)+(lg2) =2(lg5+lg2)+(lg5)+2lg5×lg2+(lg2) =2×1+(lg5+lg2) =2+1 =3