】求值:lg25+1g2×lg50+(lg2)²
问题描述:
】求值:lg25+1g2×lg50+(lg2)²
RT
答
lg25+lg2*lg50+(lg2)^2=2lg5+lg2*(1+lg5)+(lg2)^2=2lg5+lg2+lg2*lg5+(lg2)^2
=2lg5+lg2+lg2(lg5+lg2)=2lg5+lg2+lg2*lg10
=2lg5+2kg2=2(lg5+lg2)=2lg10=2