化简lg25+2/3lg8+lg5×lg20+(lg^2)2
问题描述:
化简lg25+2/3lg8+lg5×lg20+(lg^2)2
答
lg25+2/3lg8+lg5×lg20+(lg^2)2
=lg25+lg4+lg5×lg20+lg²2
=2+lg5×(1+lg2)+lg²2
=2+lg5+lg2×(lg5+lg2)
=2+lg5+lg2
=2+lg10
=2+1
=3