(lg2)^2+lg25+2/3lg8+lg5*lg20=?
来源:学生作业帮助网 编辑:作业帮 时间:2024/08/26 23:06:09
(lg2)^2+lg25+2/3lg8+lg5*lg20=?
(lg2)^2+lg25+2/3lg8+lg5*lg20=?
(lg2)^2+lg25+2/3lg8+lg5*lg20=?
(lg2)^2+lg25+2/3lg8+lg5*lg20
=(lg2)^2+2lg5+2lg2+lg5*(lg5+2lg2)
=(lg2+lg5)^2+2(lg2+lg5)
=(lg10)^2+2lg10
=1+2
=3