lg5*lg20+(lg2)^
问题描述:
lg5*lg20+(lg2)^
答
lG(5)*LG(20)+(LG(2))^2
=LG(5)*(LG(4)+LG(5))+(LG(2))^2
=(lG(5))^2+2LG(5)*LG(2)+(LG(2))^2
=(LG(5)+LG(2))^2
=(LG(10))^2=1