2lg5+lg20=?lg5*lg20=?
问题描述:
2lg5+lg20=?lg5*lg20=?
答
lg5^2 2/3lg8 lg5*lg20 (lg2)^2 =2lg5 2/3lg2^3 lg5*lg(4*5) (lg2)^2 =2lg5 2lg2 (lg5)^2 lj5*2lg2 )lg2)^2 =2(lg2 lg
答
lg5+2
lg5+1