lg²5+lg2*lg5+lg2=lg5²+1+lg2(里面的lg5²和1是怎么得的)要过程!
问题描述:
lg²5+lg2*lg5+lg2
=lg5²+1+lg2(里面的lg5²和1是怎么得的)要过程!
答
lg2*lg5
=lg(2*5)
=lg10
=1
lg^25=lg5^2