lg5^2+2/3lg8+lg5*lg20+lg^2

分类: 作业答案 • 2021-12-19 17:42:13

问题描述：

答

=2lg5+2/3*lg2³+lg5(lg2+lg10)+lg²2
=2lg5+2lg2+lg5lg2+lg5+lg²2
=2(lg5+lg2)+lg2(lg5+lg2)+lg5
=2+lg2+lg5
=2+1
=3