(lg2)^2+lg5lg20-1
来源：学生作业帮助网 编辑：六六作业网 时间：2024/05/12 01:47:04
(lg2)^2+lg5lg20-1(lg2)^2+lg5lg20-1(lg2)^2+lg5lg20-1=(lg2)^2+lg5(lg5+lg4)-1=(lg2)^2+(lg5)^2+2*lg5*lg2
(lg2)^2+lg5lg20-1
(lg2)^2+lg5lg20-1
(lg2)^2+lg5lg20-1
=(lg2)^2+lg5(lg5+lg4)-1
=(lg2)^2+(lg5)^2+2*lg5*lg2-1
=(lg2+lg5)^2-1
=1-1
=0