计算(lg2)^2+(lg5)^2+2lg2*lg5
问题描述:
计算(lg2)^2+(lg5)^2+2lg2*lg5
答
(lg2)^2+(lg5)^2+2lg2*lg5
=(lg2+lg5)^2
=[lg(2x5)]^2
=(lg10)^2
=1