lg25+2/3lg8+lg5*lg20+(lg2)^2

分类: 作业答案 • 2021-12-28 14:36:02

问题描述：

答

lg25+2/3lg8+lg5*lg20+lg^22
=2lg5+2lg2+lg5*(2lg2+lg5)+lg2*lg2
=2(lg5+lg2)+(lg5)^2+2lg2*lg5+(lg2)^2
=2lg10+(lg5+lg2)^2
=2+1^2
=3