(lg2)^2+lg2.lg5+lg50=?
问题描述:
(lg2)^2+lg2.lg5+lg50=?
答
(lg2)^2+lg2*lg5+lg50
=lg2(lg2+lg5)+lg50
=lg2*lg(2*5)+lg50
=lg2*1+lg50
=lg2+lg50
=lg(2*50)
=lg100
=2.