lg5*lg5是(lg5)^2還是lg(5^2)還是lg10

lg5*lg5是(lg5)^2還是lg(5^2)還是lg10


lg5*lg5是(lg5)^2



lg的平方(5)+lg(2)* lg(50)怎麼算


=lg5*lg5+lg2*(1+lg5)
=lg5*(lg5+lg2)+lg2
=lg5+lg2
=1