2/3lg8+lg25+lg2·lg50+lg25

问题描述:

2/3lg8+lg25+lg2·lg50+lg25

2/3lg8+lg25+lg2·lg50+lg25
=2lg2+2lg5+(1-lg5)(1+lg5)+lg²5
=2(lg2+lg5)+1-lg²5+lg²5
=3